I've been following this thread for some reason, and I finally figured
out why.  I think I had a similar "multimedia PC" my parents bought
for me about 20 years ago (486SX 33MHz, 4MB RAM, 200MB HD, 2X CD-ROM
and Sound Card when these were still considered optional, DOS
6.22/Windows 3.11).  And I remember getting Front Page Sports Football
Pro 95, Wolfenstein, and Doom working on this.

Anyways, someone on VOGONS did a ton of research [0] on similar sound
cards.  I suggest reading it.

[0] http://www.vogons.org/viewtopic.php?t=27943

On Wed, Jun 3, 2015 at 4:58 PM, John Hupp <free...@prpcompany.com> wrote:
> I'm still working on trying to get audio CD's playing with this sound
> card, a Media Vision Pro Sonic 16 (Jazz16 chipset).  (The
> earlier-reported other problems have now all been solved.  I have sound
> in DOOM and in mpxplayer.)
> It occurred to me that this might be a cabling issue.  The card has a
> 3-pin audio CD connector instead of the usual 4-pin.  But since standard
> 4-wire cables normally join the two ground wires and connect them to a
> single pin so that only 3 pins are used, I thought I could make this
> work easily by just moving a wire in the plug module.
> But I have now tried connecting the wires to the sound card in every
> combination (I think), and the two CD players I have been testing with
> continue to fail in the same way.  CD-V complains "Invalid media!" and
> won't even start.  ACP starts, reads and displays all the track
> information, and acts as if it is playing something, but I get no sound.
> In case it adds anything, this sound card was often packaged with a
> Philips 206 CD-ROM drive.
> I have not found a pinout for the audio CD connection on either the
> sound card or the CD-ROM drive.
> My latest thought, however: Does FreeDOS and/or a certain CD player
> support sending the sound digitally to the sound card over the ribbon
> cable and the PC bus, the way modern Windows does it?  In this case I
> can dispense with the cable.  (I tried just disconnecting the cable and
> my two current CD players behaved just as before.)
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