Does it occur when you play a game selecting Sound Blaster (not using 16-bit DMA) instead of Sound Blaster 16?

As far as i know, old Creative cards specially the ISA ones can be very nasty with problems, buzzing and other bulls***. You can easy fix this with one ESS Audio Drive ISA card, is nothing interesting, and is even some cheap junk brand nothing special, but the deal with that type of brand is it just works fine with DOS games, so do yourself a favor and buy/find one ESS Audio drive, you will see it is great.

Hardware conflicts on resources maybe? Also, if you are sharing an IRQ with the sound cards, I'd recommend you change the IRQ for either sound card or conflicting resource, whatever is easier/possible.

Hi again, problem solved. I tried also ESS 1869 ISA PNP but it got frozen during PNP initialization before booting. Totally desperate i tried ISA VGA trident, no luck. Then frustrated even more i tried to switch pio mode of HDD from auto (value 4) to pio mode 3. And? Problem solved! Now everything is working 100% stable! How is it possible that pio mode has impact on sound, i have no clue! But now i am desperate of getting blood and shadow warriror working via voodoo1, anyone can tell what can i do? i tried several glide drivers, no luck so far...

Anyway, glquake, mdk, descent, dark forces II, forsaken is working under voodoo1 with no problem except low framerates, but looking for am5x86-p75 133 to overclock it to 160Mhz 😀

Good at least the problem is gone, as every single old PC hardware enthusiasts knows how some problem can drive a person mad, till fix the damn problem..
And is strange to see ESS Audio drive not fixing the things, but seems some times nothing can help if something f***s with you..

Not sure if you really solved the problem, but it might be a good idea to check -5V on your PSU (Yes, MINUS voltage). Also, check if -5V is OK on ISA slot that you've plugged the sound card.