Maybe to check in MAME if bug also exists and if it works, how it's done.
This patch appears to break the intro tune in "Frogger" - a game which relies on the tweakedaudio hack. Any ideas?
Sound Fix
Here's a quick rewrite of audio_process() in audio.c, it should work now as in MESS/MAME:...
Here is the reason : O2EM generate pseudo-random 1-bit noise using C rand()%2 calls,...