>is it true that muting an audio instrument channel (in the >environment window) does not reduce the cpu load at all? >G4/733 QS / 640 Ram It's true on my system (LAW PIII 500mHz, 128mb RAM) when I mute in the track mixer, which I guess is essentially the same thing. Fortunately muting in the Arrange page reduces CPU load though. I think that's the way it's supposed to be. Cheers, Andy