How do you A/B in PTLE, say to toggle between guitar tracks to compare how they sound? I've been doing it the pain-in-the-ass way by doing the quick "mute G1, mute G2, unmute G3, unmute G4", but it's to the point where I'm getting real sick of doing all that mouse control!!! I know there's gotta be a better way, at the touch of a button. I've been trying to use groups, but still I can't figure out how to do it without doing two mouse-clicks. What can I do? Thanks.