that actually hurt some of the games I have more then it helped, I haven't found problems with my triangle code, does the game you're testing use an obsure mapper? I'd like to try it. what I do have problems with is my square wave code, the only game I've tested where it doesn't work right is zelda, and only in the inro screen, I think this may be related to the problem you were talking about a while back. basically the two channles are playing the same sound but it's out of phase, it doesn't cancel it out like I you're problem, but it sounds jacked up, but I think it's an emualtion problem, did you ever fix the problems you where having with duck tales?