Hi,
i am currently working on the Genesis Plus Port for Gamecube as it appears some games doesn't have sound working properly (only fx sound, no music): Castle of Illusion and Quackshot for example, but also Thunderforce 4, Wonderboy (the shooting game) and Undead Line

I was wondering what could be the possible cause of this:

- unaccurate timing between Z80 and 68000 (bus request mechanism)
- emulation bug (but the majority of games have music working just fine)
- YM2612 or z80 or 68000 core bug

If someone with good experience with the Genesis could help me finding where the problem could come from, i would appreciate a lot ;-)
thanks