The DR-DOS/OpenDOS Enhancement Project

>>I knew that link, I asked you about SNAP AUDIO API, not about MGL GRAPHICS library and its VIDEO drivers. What file from there has
information about AUDIO API?<<

That is the latest release of the SNAP SDK. If it does not cover SNAP
Audio, I guess it is only in the Perforce archive. Unfortunately,
there is no Perforce client for DOS, and I did not have the time to
check whether I could access it with DOSLinux.

>> About the second part: that is just in case you want to emulate SB or other old
card.<<

Alas, that is the only way to make old software use newer cards
since most of it uses direct hardware access.

>> And IO port trapping is
conflicting with DPMI specification. <<

I have never heard of that before. Where did you get this info?