>I've got an MC6800 (no, not 68000) that runs at one full megahertz. >Now THAT would be a challenge to make 2 DCOs at 44 KHz... Hmmm... Not sure about the 6800, but with the Z80 you might be able playing tricks using the Refresh register. If it's good enough for video generation, it ought to be usable for audio. Rainer