Hi, I have this tiny PC Chips board:
https://theretroweb.com/motherboards/s/pcchips-m571lmr-v1-x

It has an annoying issue with specific games only. The PC hangs when it plays a digital sound along with an Adlib note start at the same time.
Two games that repro this are Mortal Kombat 1 and Lemmings 2. In MK it happens in the character select screen as the gong sfx is played and the music starts. The hang is not always immediate at that moment, sometimes it happens a second after.

Disabling music fixes the problem.. disabling digital sound also fixes the problem. Just dont play both together.

Tried toggling all the options exposed in the BIOS and nothing helped. So started trying all BIOSes I could find on TRW.. all official BIOSes exhibit the same issue. They are AMI bios.

Finally I stumbled on an Award BIOS from a different board that actually worked on my board, and also fixed the sound issue completely. It is the BIOS of this board:
https://theretroweb.com/motherboards/s/soyo-sy-5stm

The problem with this one is that it doesn't recognize my motherboard's CPU Plug'n'Play feature, which automatically recognizes voltage and clock speed multipliers for the CPU. My board actually has no jumpers for these as it's all software.
The Award bios comes from a motherboard that doesn't have the CPU Plug'n'Play feature... and it is causing the board to detect my 233MMX CPU as 150MHz, so it's not ideal.

What are my options now? Would I be right if I guess the sound fix is due to certain chipset registers being set right by the Award bios compared to the Ami bios?
If so, is it possible to somehow identify these registers and update the AMI bios to set them correctly?

I did try playing with AMIBCP to expose all hidden options in the Ami bios, but none of those options made a difference.

Ideas?

Cheers!