Posting on the off-chance somebody with any ideas didn't see it, but I suspect this to be a lost cause.

I have a PAS Plus - well, it's a model with external SCSI and some weirdness, but it's still a PAS Plus to all intents and purposes - which stopped working properly. Towards the end of playing ROTH on the system it is installed in I fired my staff, which is excessively loud in that game, only to hear the sounds distort and not return to normality. I can not find anything which appears amiss on the card aside from leaking capacitors which I replaced quickly with good Nichicon ones.

Some of my observations are recorded on video; https://www.youtube.com/watch?v=VjBNBo2Anrs

Other observations so far are that if I touch the MIC input the pulse returns. I also found that if I attach a cable when the pulsing is audible anyway, the card screams. Sometimes muting the "MIXER" in the mixer software improves the audio quality. I moved the card to another slot and any time the card produces sound it causes the screen to misbehave, appearing as though it somehow degrades or interferes with the ANALOG signal to the display. Dark Forces cannot play audio from the PAS but the SB part works. IIS WinPlay yields better audio than the PAS Wav player, to the point it is nearly usable. I have long suspected the latter actually plays through the Thunder chip and not the PAS part of the card.

I have tried a SB16 in the system and it works fine, I suspect no problem with the computer but I can test the PAS in another if you think it's worth doing.

So far I have;
> Tested with an SB16 which works in the system just fine... Actually sounds cleaner than it does in the K5 I loaned it from.
> Re-capped the PAS after the problem appeared.
> De-soldered the MIC socket and got rid of the jumpers that connect to it in the hopes of breaking the problem circuit, but it changes nothing.
> Tested a lot of the card on various meters, it all checks out.
> Left the card playing loud music at max volume for a long time in the hopes the defective part would heat up or blow.
> Played with the drivers on the off-chance it was software related, despite me changing hard drive since the problem appeared anyway.

Anybody have any ideas? If you need pictures I can get them but they won't be as good as usual because my camera is out of action. Obviously I can record the card misbehaving directly.

I think it's a lost cause, but I figure it's worth asking because sometimes the planets align and a second brain thinks of something the first one missed. If there's nothing I can do, I might try transplanting the transistors to a dead PAS16 I have, on which those were blown when I received it. I'd feel bad butchering such a nice card, but if there's no fix it may as well be put to use in an attempt to make another good card work eh?