{"id":1526,"date":"2026-11-12T12:59:12","date_gmt":"2026-11-12T12:59:12","guid":{"rendered":"https:\/\/www.r3tr0.net\/index.php\/wondermca-documentation\/wmdoc_mp3-player\/"},"modified":"2026-11-12T18:45:11","modified_gmt":"2026-11-12T18:45:11","slug":"wmdoc_mp3-player","status":"publish","type":"page","link":"https:\/\/www.r3tr0.net\/index.php\/wondermca-documentation\/wmdoc_mp3-player\/","title":{"rendered":"WonderMCA: MP3 player"},"content":{"rendered":"\n<div class=\"wp-block-group wmdoc-hero has-text-color has-background has-link-color wp-elements-1 is-layout-constrained wp-container-core-group-is-layout-89221c49 wp-block-group-is-layout-constrained\" style=\"border-radius:10px;color:#edf5ff;background-color:#001141;margin-bottom:32px;padding-top:28px;padding-right:32px;padding-bottom:28px;padding-left:32px\">\n<p class=\"has-text-color wp-block-paragraph\" style=\"color:#78a9ff;margin-bottom:8px;font-size:13px;font-weight:600;letter-spacing:2px;text-transform:uppercase\">WonderMCA \u00b7 User documentation<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"margin-top:0;font-size:19px;line-height:1.55\">Play the MP3 files of the microSD card or of the USB stick on your PS\/2: WMPLAY, the full-screen player with its spectrum display, and the wmctrl mp3 commands for the DOS prompt and batch files.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"margin-top:12px;font-size:14px\"><a href=\"https:\/\/www.r3tr0.net\/index.php\/wondermca-documentation\/\">\u2190 WonderMCA documentation home<\/a> \u00b7 Page 20<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-group wmdoc-toc has-border-color has-background is-layout-constrained wp-container-core-group-is-layout-67fe145d wp-block-group-is-layout-constrained\" style=\"border-color:#dcdcde;border-width:1px;border-radius:8px;background-color:#f6f7f7;margin-bottom:32px;padding-top:16px;padding-right:24px;padding-bottom:16px;padding-left:24px\">\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>On this page \u2014 5 sections<\/summary>\n<ul class=\"wp-block-list\">\n<li><a href=\"#what-you-need\">What you need<\/a><\/li>\n\n\n\n<li><a href=\"#putting-music-on-the-card\">Putting music on the card<\/a><\/li>\n\n\n\n<li><a href=\"#wmplay-the-full-screen-player\">WMPLAY, the full-screen player<\/a><\/li>\n\n\n\n<li><a href=\"#wmctrl-mp3-the-commands\">WMCTRL MP3, the commands<\/a><\/li>\n\n\n\n<li><a href=\"#limits\">Limits<\/a><\/li>\n<\/ul>\n<\/details>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">The card plays the MP3 files of its microSD card or of its USB stick by itself. The PS\/2 only gives the orders: play, pause, next. It does not read the file and it does not decode it, so the processor of the PS\/2 does not matter, and a game or a DOS program keeps running while the music plays.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The music comes out where the other sounds of the card come out: the jack and the Micro Channel audio line, or the Bluetooth headphones (<a href=\"https:\/\/www.r3tr0.net\/index.php\/wondermca-documentation\/wmdoc_sound-game-port\/#the-audio-output\">The audio output<\/a>). It is mixed with the Sound Blaster, the AdLib and the CD audio.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">There are three ways to use it:<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>Program<\/th><th>What it is for<\/th><\/tr><\/thead><tbody><tr><td><code class=\"\" data-line=\"\">WMPLAY<\/code><\/td><td>A full-screen player: you browse the folders of the card, play, pause, skip, and watch the spectrum<\/td><\/tr><tr><td><code class=\"\" data-line=\"\">WMCTRL MP3<\/code><\/td><td>One command per action, for the DOS prompt and for batch files<\/td><\/tr><tr><td>The screenpad<\/td><td><strong>Audio<\/strong> &gt; <strong>MP3 player<\/strong> on the card&#8217;s own display: the folders of the microSD card, play, pause, stop, next, the knob for the volume. No PC program needed (<a href=\"https:\/\/www.r3tr0.net\/index.php\/wondermca-documentation\/wmdoc_screenpad\/#mp3-player\">Screenpad reference<\/a>)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The three drive the same player: a file started from one shows on the others.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized has-custom-border\"><img loading=\"lazy\" decoding=\"async\" width=\"720\" height=\"400\" src=\"https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_playing_v2.png\" alt=\"WMPLAY while a song plays: the folder &#92;MUSIC&#92;SYNTH on the left with the bar on 02 Neon Harbor.mp3, on the right the name of the song, Playing 01:23, the volume, the spectrum, the two level meters and the line File 2 of 9\" class=\"wp-image-1560\" style=\"border-radius:6px;width:560px;height:auto\" srcset=\"https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_playing_v2.png 720w, https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_playing_v2-300x167.png 300w, https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_playing_v2-600x333.png 600w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><figcaption class=\"wp-element-caption\">WMPLAY while a song plays: the folder &#92;MUSIC&#92;SYNTH on the left with the bar on 02 Neon Harbor.mp3, on the right the name of the song, Playing 01:23, the volume, the spectrum, the two level meters and the line File 2 of 9<\/figcaption><\/figure>\n\n\n\n<h2 id=\"what-you-need\" class=\"wp-block-heading\">What you need<\/h2>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>You need<\/th><th>Why<\/th><\/tr><\/thead><tbody><tr><td><strong>A firmware with the MP3 player<\/strong><\/td><td>The MP3 player comes with the firmware. With an older firmware, both programs answer that the firmware has no MP3 player: update the firmware (<a href=\"https:\/\/www.r3tr0.net\/index.php\/wondermca-documentation\/wmdoc_firmware-cpld-update\/\">Firmware and CPLD update<\/a>)<\/td><\/tr><tr><td><strong>The audio output not Off<\/strong><\/td><td><strong>Output<\/strong> on the <strong>Audio<\/strong> page of the setup menu must be <strong>On<\/strong> (in a firmware with Bluetooth: <strong>Jack<\/strong> or <strong>BT<\/strong>). With <strong>Off<\/strong> the card plays nothing and says so (<a href=\"https:\/\/www.r3tr0.net\/index.php\/wondermca-documentation\/wmdoc_sound-game-port\/#the-audio-output\">The audio output<\/a>)<\/td><\/tr><tr><td><strong><code class=\"\" data-line=\"\">WMPLAY.EXE<\/code> and <code class=\"\" data-line=\"\">WMCTRL.EXE<\/code><\/strong><\/td><td>They are on the tools floppy image <code class=\"\" data-line=\"\">wmtools.img<\/code>. Mount that image as a floppy and copy them to your hard disk (<a href=\"https:\/\/www.r3tr0.net\/index.php\/wondermca-documentation\/wmdoc_usage-guide\/\">Usage guide<\/a>)<\/td><\/tr><tr><td><strong>MP3 files on the card<\/strong><\/td><td>On the microSD card or on the USB stick, in any folder<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The CPLD does not change for the MP3 player.<\/p>\n\n\n\n<h2 id=\"putting-music-on-the-card\" class=\"wp-block-heading\">Putting music on the card<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Switch the PS\/2 off and take the microSD card out of the WonderMCA.<\/li>\n\n\n\n<li>Put the microSD card in your computer.<\/li>\n\n\n\n<li>Create a folder for the music, for example <code class=\"\" data-line=\"\">MUSIC<\/code>, next to <code class=\"\" data-line=\"\">FLOPPY<\/code>, <code class=\"\" data-line=\"\">HDD<\/code> and <code class=\"\" data-line=\"\">CDROM<\/code>.<\/li>\n\n\n\n<li>Copy your <code class=\"\" data-line=\"\">.mp3<\/code> files into it. Make one sub-folder per album if you like.<\/li>\n\n\n\n<li>Put the microSD card back and switch the PS\/2 on.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">A USB stick works the same way: copy the files to it and plug it into the USB-A port of the card.<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>Rule<\/th><th>Value<\/th><\/tr><\/thead><tbody><tr><td>Files<\/td><td>MP3 files, with the extension <code class=\"\" data-line=\"\">.mp3<\/code>. Any bit rate, constant or variable, mono or stereo, 8 to 48 kHz<\/td><\/tr><tr><td>Names<\/td><td>Long names and spaces are allowed. The list of WMPLAY shows the first 20 characters of a name<\/td><\/tr><tr><td>Folders<\/td><td>As deep as you like, up to 100 characters for the whole path of a folder, counted with the short DOS names<\/td><\/tr><tr><td>Files in one folder<\/td><td>WMPLAY shows the first 256 entries of a folder<\/td><\/tr><tr><td>Play order<\/td><td>By name. Start the names with the track number (<code class=\"\" data-line=\"\">01<\/code>, <code class=\"\" data-line=\"\">02<\/code>, &#8230;) to keep the order of an album<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">WMPLAY shows the name of the file. It does not read the title and the artist stored inside the file.<\/p>\n\n\n\n<h2 id=\"wmplay-the-full-screen-player\" class=\"wp-block-heading\">WMPLAY, the full-screen player<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Type <code class=\"\" data-line=\"\">WMPLAY<\/code> at the DOS prompt. The player opens on the root of the microSD card.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized has-custom-border\"><img loading=\"lazy\" decoding=\"async\" width=\"720\" height=\"400\" src=\"https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_start_v2.png\" alt=\"WMPLAY just started: the folders CDROM, FLOPPY, HDD and MUSIC of the microSD card on the left, the bar on the first; on the right &quot;(nothing yet: Enter plays the highlighted file)&quot; and Idle 00:00\" class=\"wp-image-1561\" style=\"border-radius:6px;width:560px;height:auto\" srcset=\"https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_start_v2.png 720w, https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_start_v2-300x167.png 300w, https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_start_v2-600x333.png 600w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><figcaption class=\"wp-element-caption\">WMPLAY just started: the folders CDROM, FLOPPY, HDD and MUSIC of the microSD card on the left, the bar on the first; on the right &#8220;(nothing yet: Enter plays the highlighted file)&#8221; and Idle 00:00<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>Part of the screen<\/th><th>What it shows<\/th><\/tr><\/thead><tbody><tr><td>The top line<\/td><td><strong>WonderMCA MP3 Player<\/strong> and, on the right, the volume you browse: <strong>microSD<\/strong> or <strong>USB<\/strong><\/td><\/tr><tr><td>The left box<\/td><td>The folder: its path in the frame, sub-folders in brackets, then the MP3 files with their size. Under it, the position of the bar and the number of rows, such as <strong>3\/10<\/strong><\/td><\/tr><tr><td>The right box, <strong>Now playing<\/strong><\/td><td>The file that plays, its state and time, the volume, the spectrum and the level meters<\/td><\/tr><tr><td>The line under the boxes<\/td><td>A message when something cannot be done. It stays about 4 seconds<\/td><\/tr><tr><td>The bottom line<\/td><td>The main keys<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 id=\"browsing\" class=\"wp-block-heading\">Browsing<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Move the bar with <strong>Up<\/strong> and <strong>Down<\/strong>. Press <strong>Enter<\/strong> on a folder to open it, and <strong>Backspace<\/strong> to go back to the folder above. The row <strong>[..]<\/strong> at the top of a folder does the same as <strong>Backspace<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized has-custom-border\"><img loading=\"lazy\" decoding=\"async\" width=\"720\" height=\"400\" src=\"https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_folder_v2.png\" alt=\"The folder &#92;MUSIC&#92;SYNTH: the row that leads back to the folder above, then nine songs from 01 Night Drive.mp3 to 09 Daybreak.mp3 with their sizes; the bar is on the first song and the counter shows 2\/10\" class=\"wp-image-1562\" style=\"border-radius:6px;width:560px;height:auto\" srcset=\"https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_folder_v2.png 720w, https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_folder_v2-300x167.png 300w, https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_folder_v2-600x333.png 600w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><figcaption class=\"wp-element-caption\">The folder &#92;MUSIC&#92;SYNTH: the row that leads back to the folder above, then nine songs from 01 Night Drive.mp3 to 09 Daybreak.mp3 with their sizes; the bar is on the first song and the counter shows 2\/10<\/figcaption><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Only folders and MP3 files are listed: folders first, then the files, each group by name.<\/li>\n\n\n\n<li>The size is in KB (<strong>252K<\/strong>) or in MB (<strong>3.6M<\/strong>).<\/li>\n\n\n\n<li>A name longer than its row scrolls while the bar is on it: it stays still a second, moves to its end, stays a second, and starts again. The other rows show the start of their name.<\/li>\n\n\n\n<li>In a folder with more rows than the box can show, the list scrolls with the bar. <strong>PgUp<\/strong>, <strong>PgDn<\/strong>, <strong>Home<\/strong> and <strong>End<\/strong> move faster.<\/li>\n\n\n\n<li>A <strong>+<\/strong> after the counter, such as <strong>256\/256+<\/strong>, means that the folder has more than 256 entries: the rest is not shown.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized has-custom-border\"><img loading=\"lazy\" decoding=\"async\" width=\"720\" height=\"400\" src=\"https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_long_list_v2.png\" alt=\"A folder of 34 tunes: the list has scrolled to Tune 10 to Tune 29, the bar is on Tune 29 and the counter shows 30\/35; Tune 07.mp3 plays, 01:04\" class=\"wp-image-1563\" style=\"border-radius:6px;width:560px;height:auto\" srcset=\"https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_long_list_v2.png 720w, https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_long_list_v2-300x167.png 300w, https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_long_list_v2-600x333.png 600w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><figcaption class=\"wp-element-caption\">A folder of 34 tunes: the list has scrolled to Tune 10 to Tune 29, the bar is on Tune 29 and the counter shows 30\/35; Tune 07.mp3 plays, 01:04<\/figcaption><\/figure>\n\n\n\n<h3 id=\"playing\" class=\"wp-block-heading\">Playing<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Press <strong>Enter<\/strong> on a file. The file starts, and the MP3 files of that folder become the play list.<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>On the screen<\/th><th>Meaning<\/th><\/tr><\/thead><tbody><tr><td><strong>02 Neon Harbor.mp3<\/strong><\/td><td>The name of the file that plays. In the list on the left it has a small arrow in front<\/td><\/tr><tr><td><strong>Playing 01:23<\/strong>, the bar, <strong>02:40<\/strong><\/td><td>The state, the time played, the song as a bar that fills while it plays, and its length, in minutes and seconds. The states are <strong>Idle<\/strong>, <strong>Playing<\/strong>, <strong>Paused<\/strong>, <strong>Stopped<\/strong>, <strong>Finished<\/strong> and <strong>Error<\/strong>. <strong>&#45;&#45;:&#45;&#45;<\/strong> when the length is not known. <strong>Left<\/strong> and <strong>Right<\/strong> jump 10 seconds<\/td><\/tr><tr><td><strong>44100 Hz stereo 192 kbit\/s<\/strong>, on the frame of the box<\/td><td>What the file is. With a variable bit rate file the last number moves<\/td><\/tr><tr><td><strong>Volume<\/strong>, the bar and the number<\/td><td>The volume of the MP3, 0 to 100<\/td><\/tr><tr><td><strong>[L]oop off<\/strong>, <strong>[C]ont on<\/strong><\/td><td>The two play modes and the keys that change them<\/td><\/tr><tr><td>The spectrum<\/td><td>The music in 48 bands, from the bass on the left (43 Hz) to the treble on the right (15 kHz), like the display of a hi-fi set. A band is a column of 44 small segments: blue at the bottom, then cyan, green, yellow, red, and magenta at the very top. The segment that stays alone above a band is its last peak: it stays 2 seconds, then comes down<\/td><\/tr><tr><td><strong>L<\/strong> and <strong>R<\/strong><\/td><td>The level of the left and of the right channel. The end of the scale is yellow, then red. The white square is the last peak: it stays 2 seconds, then comes down<\/td><\/tr><tr><td><strong>File 2 of 9<\/strong><\/td><td>The place of the file in the play list<\/td><\/tr><tr><td><strong>Next: 03GLAS~1.MP3<\/strong><\/td><td>The file that starts when this one ends, by its short DOS name. A file whose name has accented letters or typographic signs, and every file of an exFAT card, has no usable short name: the card then makes one from the first letters of the name and a number, such as <code class=\"\" data-line=\"\">GLASSC?3.MP3<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The screen follows the music about 18 times a second.<\/p>\n\n\n\n<h3 id=\"the-keys\" class=\"wp-block-heading\">The keys<\/h3>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>Key<\/th><th>What it does<\/th><\/tr><\/thead><tbody><tr><td><strong>Up<\/strong>, <strong>Down<\/strong>, <strong>PgUp<\/strong>, <strong>PgDn<\/strong>, <strong>Home<\/strong>, <strong>End<\/strong><\/td><td>Move the bar in the list<\/td><\/tr><tr><td><strong>Enter<\/strong><\/td><td>Open the folder, or play the file. The files of that folder become the play list<\/td><\/tr><tr><td><strong>Backspace<\/strong><\/td><td>Back to the folder above<\/td><\/tr><tr><td><strong>Tab<\/strong><\/td><td>Switch between the microSD card and the USB stick<\/td><\/tr><tr><td><strong>Space<\/strong><\/td><td>Pause, resume<\/td><\/tr><tr><td><strong>N<\/strong>, <strong>P<\/strong><\/td><td>The next, the previous file of the play list<\/td><\/tr><tr><td><strong>S<\/strong><\/td><td>Stop<\/td><\/tr><tr><td><strong>+<\/strong>, <strong>&#8211;<\/strong><\/td><td>The volume of the MP3, in steps of 5<\/td><\/tr><tr><td><strong>Right<\/strong>, <strong>Left<\/strong><\/td><td>10 seconds on, 10 seconds back in the song, also while it is paused. Never past its last second, never before its start<\/td><\/tr><tr><td><strong>L<\/strong><\/td><td>Loop the file: on, off<\/td><\/tr><tr><td><strong>C<\/strong><\/td><td>Continuous play: on, off<\/td><\/tr><tr><td><strong>Esc<\/strong><\/td><td>Leave WMPLAY. The music goes on<\/td><\/tr><tr><td><strong>Q<\/strong><\/td><td>Stop the music and leave WMPLAY<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><code class=\"\" data-line=\"\">WMPLAY \/?<\/code> prints the keys and the version of WMPLAY, which is also on the top line (<strong>0x0050<\/strong>).<\/p>\n\n\n\n<h3 id=\"pause-and-stop\" class=\"wp-block-heading\">Pause and stop<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Space<\/strong> pauses the music and <strong>Space<\/strong> again resumes it at the same place. <strong>S<\/strong> stops it: the next <strong>Enter<\/strong> starts a file from its beginning.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized has-custom-border\"><img loading=\"lazy\" decoding=\"async\" width=\"720\" height=\"400\" src=\"https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_paused_v2.png\" alt=\"Space pressed: the state reads Paused 01:23, the spectrum and the two level meters are dark\" class=\"wp-image-1564\" style=\"border-radius:6px;width:560px;height:auto\" srcset=\"https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_paused_v2.png 720w, https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_paused_v2-300x167.png 300w, https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_paused_v2-600x333.png 600w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><figcaption class=\"wp-element-caption\">Space pressed: the state reads Paused 01:23, the spectrum and the two level meters are dark<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The spectrum does not go dark at once: the bands fall, and their peaks stay 2 seconds before they come down.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized has-custom-border\"><img loading=\"lazy\" decoding=\"async\" width=\"720\" height=\"400\" src=\"https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_spectrum_v2.gif\" alt=\"The spectrum of a song that plays for 6 seconds, then Space is pressed: the bands fall, the peak segments stay where they were for 2 seconds and come down\" class=\"wp-image-1569\" style=\"border-radius:6px;width:560px;height:auto\"\/><figcaption class=\"wp-element-caption\">The spectrum of a song that plays for 6 seconds, then Space is pressed: the bands fall, the peak segments stay where they were for 2 seconds and come down<\/figcaption><\/figure>\n\n\n\n<h3 id=\"volume-loop-and-continuous-play\" class=\"wp-block-heading\">Volume, loop and continuous play<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>+<\/strong> and <strong>&#8211;<\/strong> change the volume of the MP3 only, in steps of 5. The <strong>Volume<\/strong> and <strong>Mute<\/strong> of the screenpad act on all the sounds of the card, the MP3 included.<\/li>\n\n\n\n<li><strong>C<\/strong> switches the continuous play. It is on when WMPLAY starts: at the end of a file the next file of the play list starts. With <strong>[C]ont off<\/strong> the music stops at the end of the file.<\/li>\n\n\n\n<li><strong>L<\/strong> switches the loop. With <strong>[L]oop on<\/strong> the same file starts again at its end, and no next file is announced.<\/li>\n\n\n\n<li>You can open another folder while the music plays: the play list stays the one of the folder the music comes from. If the next file starts while you look at another folder, <strong>Now playing<\/strong> shows its short DOS name.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized has-custom-border\"><img loading=\"lazy\" decoding=\"async\" width=\"720\" height=\"400\" src=\"https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_volume_loop_v2.png\" alt=\"04 Midnight Line.mp3 plays, 00:37: the volume bar is shorter and reads 60, the loop reads on in green, the line under the meters reads File 4 of 9 and announces no next file\" class=\"wp-image-1571\" style=\"border-radius:6px;width:560px;height:auto\" srcset=\"https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_volume_loop_v2.png 720w, https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_volume_loop_v2-300x167.png 300w, https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_volume_loop_v2-600x333.png 600w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><figcaption class=\"wp-element-caption\">04 Midnight Line.mp3 plays, 00:37: the volume bar is shorter and reads 60, the loop reads on in green, the line under the meters reads File 4 of 9 and announces no next file<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">At the end of the last file of the play list the state is <strong>Finished<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized has-custom-border\"><img loading=\"lazy\" decoding=\"async\" width=\"720\" height=\"400\" src=\"https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_finished_v2.png\" alt=\"09 Daybreak.mp3, the last of nine files, has ended: Finished 00:16, File 9 of 9, a dark spectrum\" class=\"wp-image-1573\" style=\"border-radius:6px;width:560px;height:auto\" srcset=\"https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_finished_v2.png 720w, https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_finished_v2-300x167.png 300w, https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_finished_v2-600x333.png 600w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><figcaption class=\"wp-element-caption\">09 Daybreak.mp3, the last of nine files, has ended: Finished 00:16, File 9 of 9, a dark spectrum<\/figcaption><\/figure>\n\n\n\n<h3 id=\"the-microsd-card-and-the-usb-stick\" class=\"wp-block-heading\">The microSD card and the USB stick<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Tab<\/strong> shows the other volume, from its root. The top line reads <strong>USB<\/strong> and the path in the frame starts with <code class=\"\" data-line=\"\">1:<\/code>. The music does not stop when you switch.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized has-custom-border\"><img loading=\"lazy\" decoding=\"async\" width=\"720\" height=\"400\" src=\"https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_usb_v2.png\" alt=\"Tab pressed: the top line reads USB, the list shows the folders FLOPPY, HDD and PARTY and two MP3 files of the stick, while 05 Afterglow.mp3 of the microSD card goes on, 00:47\" class=\"wp-image-1574\" style=\"border-radius:6px;width:560px;height:auto\" srcset=\"https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_usb_v2.png 720w, https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_usb_v2-300x167.png 300w, https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_usb_v2-600x333.png 600w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><figcaption class=\"wp-element-caption\">Tab pressed: the top line reads USB, the list shows the folders FLOPPY, HDD and PARTY and two MP3 files of the stick, while 05 Afterglow.mp3 of the microSD card goes on, 00:47<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Without a USB stick, the list stays where it was and the message line reads <strong>No USB stick (or it cannot be read)<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized has-custom-border\"><img loading=\"lazy\" decoding=\"async\" width=\"720\" height=\"400\" src=\"https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_no_usb_v2.png\" alt=\"Tab without a USB stick: the folder &#92;MUSIC stays on the screen and the message line reads &quot;No USB stick (or it cannot be read)&quot;\" class=\"wp-image-1575\" style=\"border-radius:6px;width:560px;height:auto\" srcset=\"https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_no_usb_v2.png 720w, https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_no_usb_v2-300x167.png 300w, https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_no_usb_v2-600x333.png 600w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><figcaption class=\"wp-element-caption\">Tab without a USB stick: the folder &#92;MUSIC stays on the screen and the message line reads &#8220;No USB stick (or it cannot be read)&#8221;<\/figcaption><\/figure>\n\n\n\n<h3 id=\"leaving-wmplay\" class=\"wp-block-heading\">Leaving WMPLAY<\/h3>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>Key<\/th><th>The music<\/th><th>Use it to<\/th><\/tr><\/thead><tbody><tr><td><strong>Esc<\/strong><\/td><td>Goes on<\/td><td>Start a game or another program with the music on<\/td><\/tr><tr><td><strong>Q<\/strong><\/td><td>Stops<\/td><td>End the session<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">WMPLAY gives the DOS screen back as it was.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Ctrl-C<\/strong> and <strong>Ctrl-Break<\/strong> do nothing in WMPLAY: leave with <strong>Esc<\/strong> or <strong>Q<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">After <strong>Esc<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The file that plays goes to its end, and the music stops there: the continuous play is done by WMPLAY, so no next file starts. With the loop on, the file plays again and again.<\/li>\n\n\n\n<li><code class=\"\" data-line=\"\">WMCTRL MP3 STOP<\/code> stops the music from the DOS prompt.<\/li>\n\n\n\n<li>Start <code class=\"\" data-line=\"\">WMPLAY<\/code> again to take the controls back: it shows the state, the time, the spectrum and the meters of the music. The name of the file is not shown again and the play list is empty, until you press <strong>Enter<\/strong> on a file.<\/li>\n<\/ul>\n\n\n\n<h3 id=\"a-monochrome-screen\" class=\"wp-block-heading\">A monochrome screen<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">On a monochrome display adapter WMPLAY uses black-and-white attributes by itself. On a colour adapter with a screen that shows no colours, such as the plasma screen of a portable PS\/2, start it with <code class=\"\" data-line=\"\">WMPLAY \/M<\/code>.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized has-custom-border\"><img loading=\"lazy\" decoding=\"async\" width=\"720\" height=\"400\" src=\"https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_mono_v2.png\" alt=\"WMPLAY \/M: the screen of a playing song in grey, white and reverse video only\" class=\"wp-image-1581\" style=\"border-radius:6px;width:560px;height:auto\" srcset=\"https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_mono_v2.png 720w, https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_mono_v2-300x167.png 300w, https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_mono_v2-600x333.png 600w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><figcaption class=\"wp-element-caption\">WMPLAY \/M: the screen of a playing song in grey, white and reverse video only<\/figcaption><\/figure>\n\n\n\n<h3 id=\"if-the-spectrum-shows-line-drawing-characters\" class=\"wp-block-heading\">If the spectrum shows line-drawing characters<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">WMPLAY draws the segments of the spectrum with eleven characters of its own. It loads them into the VGA adapter of the PS\/2 when it starts and puts the characters of DOS back when it leaves.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If the spectrum shows double-line box characters instead of segments (this can happen in a DOS window of Windows or OS\/2), start WMPLAY with <code class=\"\" data-line=\"\">WMPLAY \/T<\/code>. It then uses plain characters only: a band is a column of 11 small squares.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized has-custom-border\"><img loading=\"lazy\" decoding=\"async\" width=\"720\" height=\"400\" src=\"https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_plain_v2.png\" alt=\"WMPLAY \/T: the same song, each band of the spectrum is a column of small squares\" class=\"wp-image-1583\" style=\"border-radius:6px;width:560px;height:auto\" srcset=\"https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_plain_v2.png 720w, https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_plain_v2-300x167.png 300w, https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_plain_v2-600x333.png 600w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><figcaption class=\"wp-element-caption\">WMPLAY \/T: the same song, each band of the spectrum is a column of small squares<\/figcaption><\/figure>\n\n\n\n<h3 id=\"the-messages-of-wmplay\" class=\"wp-block-heading\">The messages of WMPLAY<\/h3>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>Message<\/th><th>Meaning<\/th><th>What to do<\/th><\/tr><\/thead><tbody><tr><td><strong>No USB stick (or it cannot be read)<\/strong><\/td><td><strong>Tab<\/strong> found no USB volume<\/td><td>Plug the stick and press <strong>Tab<\/strong> again (<a href=\"https:\/\/www.r3tr0.net\/index.php\/wondermca-documentation\/wmdoc_usb\/\">USB devices<\/a>)<\/td><\/tr><tr><td><strong>Not an MP3 file<\/strong><\/td><td>The card found no MP3 data at the start of the file<\/td><td>Check the file on your computer<\/td><\/tr><tr><td><strong>Not found on the card<\/strong><\/td><td>The file is no longer there<\/td><td>Leave the folder and open it again<\/td><\/tr><tr><td><strong>The sound output of the card is off<\/strong><\/td><td>The audio output is <strong>Off<\/strong><\/td><td>Set <strong>Output<\/strong> on the <strong>Audio<\/strong> page of the setup menu to <strong>On<\/strong> (in a firmware with Bluetooth: <strong>Jack<\/strong> or <strong>BT<\/strong>)<\/td><\/tr><tr><td><strong>The folder cannot be read<\/strong><\/td><td>The card could not open the folder<\/td><td>Check the microSD card<\/td><\/tr><tr><td><strong>The folder path is too long<\/strong><\/td><td>The path of the folder has more than 100 characters<\/td><td>Use shorter folder names or fewer levels<\/td><\/tr><tr><td><strong>Not possible now<\/strong><\/td><td>The card refused the key in the present state<\/td><td>Nothing<\/td><\/tr><tr><td><strong>The card does not answer<\/strong><\/td><td>The card did not answer in time<\/td><td>Leave WMPLAY and start it again<\/td><\/tr><tr><td><strong>(no MP3 file here)<\/strong>, in the list<\/td><td>The folder has no sub-folder and no MP3 file<\/td><td>Press <strong>Backspace<\/strong><\/td><\/tr><tr><td><code class=\"\" data-line=\"\">wmplay: this firmware has no MP3 player<\/code>, at the DOS prompt<\/td><td>The firmware of the card is older than the player<\/td><td>Update the firmware<\/td><\/tr><tr><td><code class=\"\" data-line=\"\">wmplay: WonderMCA not found (is the WMBIOS loaded?)<\/code>, at the DOS prompt<\/td><td>WMPLAY found no card<\/td><td>Check that the option ROM of the card starts at power-on<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized has-custom-border\"><img loading=\"lazy\" decoding=\"async\" width=\"720\" height=\"400\" src=\"https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_not_mp3_v2.png\" alt=\"Enter on Broken Download.mp3, a file that holds no MP3 data: nothing plays and the message line reads &quot;Not an MP3 file&quot;\" class=\"wp-image-1589\" style=\"border-radius:6px;width:560px;height:auto\" srcset=\"https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_not_mp3_v2.png 720w, https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_not_mp3_v2-300x167.png 300w, https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_not_mp3_v2-600x333.png 600w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><figcaption class=\"wp-element-caption\">Enter on Broken Download.mp3, a file that holds no MP3 data: nothing plays and the message line reads &#8220;Not an MP3 file&#8221;<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized has-custom-border\"><img loading=\"lazy\" decoding=\"async\" width=\"720\" height=\"400\" src=\"https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_audio_off_v2.png\" alt=\"The audio output of the card is Off: Enter on 01 Night Drive.mp3 starts nothing and the message line reads &quot;The sound output of the card is off&quot;\" class=\"wp-image-1590\" style=\"border-radius:6px;width:560px;height:auto\" srcset=\"https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_audio_off_v2.png 720w, https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_audio_off_v2-300x167.png 300w, https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_wmplay_audio_off_v2-600x333.png 600w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><figcaption class=\"wp-element-caption\">The audio output of the card is Off: Enter on 01 Night Drive.mp3 starts nothing and the message line reads &#8220;The sound output of the card is off&#8221;<\/figcaption><\/figure>\n\n\n\n<h2 id=\"wmctrl-mp3-the-commands\" class=\"wp-block-heading\">WMCTRL MP3, the commands<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><code class=\"\" data-line=\"\">WMCTRL MP3<\/code> does one thing per command. Use it at the DOS prompt, or in a batch file to start music before a program and stop it after.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized has-custom-border\"><img loading=\"lazy\" decoding=\"async\" width=\"720\" height=\"400\" src=\"https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_dos_wmctrl_mp3_v2.png\" alt=\"The DOS prompt: wmctrl mp3 play answers &quot;Playing MUSIC&#92;SYNTH&#92;01 Night Drive.mp3 (44100 Hz, stereo, 128 kbit\/s).&quot;, then status, volume 60, pause, resume, loop on and stop with their answers\" class=\"wp-image-1591\" style=\"border-radius:6px;width:560px;height:auto\" srcset=\"https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_dos_wmctrl_mp3_v2.png 720w, https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_dos_wmctrl_mp3_v2-300x167.png 300w, https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_dos_wmctrl_mp3_v2-600x333.png 600w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><figcaption class=\"wp-element-caption\">The DOS prompt: wmctrl mp3 play answers &#8220;Playing MUSIC&#92;SYNTH&#92;01 Night Drive.mp3 (44100 Hz, stereo, 128 kbit\/s).&#8221;, then status, volume 60, pause, resume, loop on and stop with their answers<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>Command<\/th><th>What it does<\/th><\/tr><\/thead><tbody><tr><td><code class=\"\" data-line=\"\">WMCTRL MP3 PLAY &lt;file&gt;<\/code><\/td><td>Plays the file. A file that already plays is replaced<\/td><\/tr><tr><td><code class=\"\" data-line=\"\">WMCTRL MP3 PLAY &lt;file&gt; \/L<\/code><\/td><td>Plays the file in a loop<\/td><\/tr><tr><td><code class=\"\" data-line=\"\">WMCTRL MP3 STATUS<\/code><\/td><td>One line, such as <code class=\"\" data-line=\"\">MP3: state=playing rate=44100 ch=2 kbps=128 pos=00:42 volume=100 loop=off<\/code><\/td><\/tr><tr><td><code class=\"\" data-line=\"\">WMCTRL MP3 PAUSE<\/code>, <code class=\"\" data-line=\"\">RESUME<\/code><\/td><td>Pause, resume<\/td><\/tr><tr><td><code class=\"\" data-line=\"\">WMCTRL MP3 STOP<\/code><\/td><td>Stop<\/td><\/tr><tr><td><code class=\"\" data-line=\"\">WMCTRL MP3 VOLUME &lt;N&gt;<\/code><\/td><td>The volume of the MP3, 0 to 100<\/td><\/tr><tr><td><code class=\"\" data-line=\"\">WMCTRL MP3 LOOP ON<\/code> or <code class=\"\" data-line=\"\">OFF<\/code><\/td><td>Loop the file, or stop at its end<\/td><\/tr><tr><td><code class=\"\" data-line=\"\">WMCTRL MP3 DIR [folder]<\/code><\/td><td>The folders and MP3 files the card finds in a folder, one per line: the size (or <code class=\"\" data-line=\"\">&lt;DIR&gt;<\/code>), the short name, the name. Without a folder: the root of the microSD card; <code class=\"\" data-line=\"\">1:<\/code> is the USB stick. WMPLAY shows the same entries: use it when WMPLAY shows a folder empty<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code class=\"\" data-line=\"\">&lt;file&gt;<\/code> is the path of the file from the root of the microSD card: <code class=\"\" data-line=\"\">MUSIC&#092;SYNTH&#092;01 Night Drive.mp3<\/code>. Start it with <code class=\"\" data-line=\"\">1:<\/code> for the USB stick: <code class=\"\" data-line=\"\">1:&#092;PARTY&#092;Dance Floor.mp3<\/code>.<\/li>\n\n\n\n<li>Long names and spaces are allowed, without quotes. The path has 127 characters at most. Upper and lower case are the same.<\/li>\n\n\n\n<li>Add <code class=\"\" data-line=\"\">\/Q<\/code> to print nothing when the command works.<\/li>\n<\/ul>\n\n\n\n<h3 id=\"in-a-batch-file\" class=\"wp-block-heading\">In a batch file<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\" data-line=\"\">@ECHO OFF\nWMCTRL MP3 PLAY MUSIC&#092;INTRO.MP3 \/L \/Q\nIF ERRORLEVEL 1 ECHO No music today.\nMYGAME\nWMCTRL MP3 STOP \/Q<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>Exit code<\/th><th>Meaning<\/th><\/tr><\/thead><tbody><tr><td>0<\/td><td>The command worked<\/td><\/tr><tr><td>1<\/td><td>The card refused it: file not found, not an MP3 file, the audio output is off, or not possible now<\/td><\/tr><tr><td>2<\/td><td>Usage error<\/td><\/tr><tr><td>5<\/td><td>No WonderMCA found<\/td><\/tr><tr><td>6<\/td><td>The firmware of the card has no MP3 player. Update the firmware<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 id=\"the-answers-when-a-command-fails\" class=\"wp-block-heading\">The answers when a command fails<\/h3>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized has-custom-border\"><img loading=\"lazy\" decoding=\"async\" width=\"720\" height=\"400\" src=\"https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_dos_wmctrl_mp3_errors_v2.png\" alt=\"The DOS prompt: play of a missing file answers &quot;file not found on the card&quot;, play of a wrong file &quot;not an MP3 file&quot;, pause with nothing playing &quot;not possible in this state (is a file playing?)&quot;, play with the audio output off &quot;the sound output of the card is off (wmctrl sound output on)&quot;, volume 150 the usage text, and status on an older firmware &quot;this firmware has no MP3 player&quot;\" class=\"wp-image-1592\" style=\"border-radius:6px;width:560px;height:auto\" srcset=\"https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_dos_wmctrl_mp3_errors_v2.png 720w, https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_dos_wmctrl_mp3_errors_v2-300x167.png 300w, https:\/\/www.r3tr0.net\/wp-content\/uploads\/2026\/11\/wm_dos_wmctrl_mp3_errors_v2-600x333.png 600w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><figcaption class=\"wp-element-caption\">The DOS prompt: play of a missing file answers &#8220;file not found on the card&#8221;, play of a wrong file &#8220;not an MP3 file&#8221;, pause with nothing playing &#8220;not possible in this state (is a file playing?)&#8221;, play with the audio output off &#8220;the sound output of the card is off (wmctrl sound output on)&#8221;, volume 150 the usage text, and status on an older firmware &#8220;this firmware has no MP3 player&#8221;<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>Answer<\/th><th>Meaning<\/th><\/tr><\/thead><tbody><tr><td><code class=\"\" data-line=\"\">wmctrl: file not found on the card<\/code><\/td><td>No such file. Check the path and the name<\/td><\/tr><tr><td><code class=\"\" data-line=\"\">wmctrl: not an MP3 file<\/code><\/td><td>The card found no MP3 data at the start of the file<\/td><\/tr><tr><td><code class=\"\" data-line=\"\">wmctrl: not possible in this state (is a file playing?)<\/code><\/td><td><code class=\"\" data-line=\"\">PAUSE<\/code> without music, <code class=\"\" data-line=\"\">RESUME<\/code> without a pause, <code class=\"\" data-line=\"\">STOP<\/code> with no file<\/td><\/tr><tr><td><code class=\"\" data-line=\"\">wmctrl: the sound output of the card is off (wmctrl sound output on)<\/code><\/td><td>The audio output is <strong>Off<\/strong>. <code class=\"\" data-line=\"\">WMCTRL SOUND OUTPUT ON<\/code> switches it on for the next start of the PS\/2<\/td><\/tr><tr><td><code class=\"\" data-line=\"\">wmctrl: the volume must be a number from 0 to 100<\/code><\/td><td>A wrong value, followed by the usage text<\/td><\/tr><tr><td><code class=\"\" data-line=\"\">wmctrl: this firmware has no MP3 player<\/code><\/td><td>Update the firmware<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 id=\"limits\" class=\"wp-block-heading\">Limits<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>One file plays at a time.<\/li>\n\n\n\n<li>The file must be on the microSD card or on the USB stick itself. A file inside a hard disk image is not seen: copy it to the card first, for example with <code class=\"\" data-line=\"\">WMDFS<\/code> (<a href=\"https:\/\/www.r3tr0.net\/index.php\/wondermca-documentation\/wmdoc_usage-guide\/#the-microsd-card-and-the-usb-stick-as-dos-drives\">Usage guide<\/a>).<\/li>\n\n\n\n<li>A jump with <strong>Left<\/strong> or <strong>Right<\/strong> lands on a whole second. In a variable bit rate file without a VBR header (most files have one) the length and the jumps are estimates.<\/li>\n\n\n\n<li>Only MP3 files. Play lists (<code class=\"\" data-line=\"\">.m3u<\/code>) are not read: the play list is the folder.<\/li>\n\n\n\n<li>There is no random order.<\/li>\n\n\n\n<li>The continuous play needs WMPLAY on the screen, or a file started from the screenpad (the card then starts the next file of the folder by itself). <code class=\"\" data-line=\"\">WMCTRL MP3 PLAY<\/code> plays one file, or one file in a loop.<\/li>\n\n\n\n<li>With Bluetooth headphones the sound comes a little later than on the jack (<a href=\"https:\/\/www.r3tr0.net\/index.php\/wondermca-documentation\/wmdoc_sound-game-port\/#bluetooth-headphones\">Bluetooth headphones<\/a>).<\/li>\n\n\n\n<li>Building the firmware yourself: the CMake option <code class=\"\" data-line=\"\">-DMP3_PLAYER=OFF<\/code> leaves the MP3 player out (the default is on).<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\" style=\"margin-top:48px;margin-bottom:24px\"\/>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-7387b849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<div class=\"wp-block-group has-background is-layout-constrained wp-container-core-group-is-layout-0ee9f569 wp-block-group-is-layout-constrained\" style=\"border-radius:8px;background-color:#f6f7f7;padding-top:14px;padding-right:18px;padding-bottom:14px;padding-left:18px\">\n<p class=\"has-text-align-left has-text-color wp-block-paragraph\" style=\"color:#0f62fe;margin-bottom:2px;font-size:12px;font-weight:600;letter-spacing:2px;text-transform:uppercase\">\u2190 Previous<\/p>\n\n\n\n<p class=\"has-text-align-left wp-block-paragraph\" style=\"margin-top:0;font-size:17px;font-weight:600\"><a href=\"https:\/\/www.r3tr0.net\/index.php\/wondermca-documentation\/wmdoc_bluetooth\/\">Bluetooth<\/a><\/p>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<div class=\"wp-block-group has-background is-layout-constrained wp-container-core-group-is-layout-0ee9f569 wp-block-group-is-layout-constrained\" style=\"border-radius:8px;background-color:#f6f7f7;padding-top:14px;padding-right:18px;padding-bottom:14px;padding-left:18px\">\n<p class=\"has-text-align-right has-text-color wp-block-paragraph\" style=\"color:#0f62fe;margin-bottom:2px;font-size:12px;font-weight:600;letter-spacing:2px;text-transform:uppercase\">Related \u2192<\/p>\n\n\n\n<p class=\"has-text-align-right wp-block-paragraph\" style=\"margin-top:0;font-size:17px;font-weight:600\"><a href=\"https:\/\/www.r3tr0.net\/index.php\/wondermca-documentation\/wmdoc_sound-game-port\/\">Sound and game port<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n<p class=\"has-text-align-center has-text-color wp-block-paragraph\" style=\"color:#787c82;margin-top:20px;font-size:13px\">WonderMCA user documentation \u00b7 <a href=\"https:\/\/www.r3tr0.net\/index.php\/wondermca-documentation\/\">Documentation home<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Play the MP3 files of the microSD card or of the USB stick on your PS\/2: WMPLAY, the full-screen player with its spectrum display, and the wmctrl mp3 commands for the DOS prompt and batch files.<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1277,"menu_order":20,"comment_status":"closed","ping_status":"closed","template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"tags":[],"class_list":["post-1526","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the 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