I'm working on a tune with a buddy via internet- sending files back and forth. It works pretty well, but between our differences and bits of latency here and there, it's easy to get things just out of synch enough to be a problem. Latency is low enough not to be readily discernable at any given moment, but high enough that when multiple tracks are going back and forth, it can kind of add up. I'd like to find a way to get a sharp click into the beginning of a vocal track, but it turns out to be a non-trivial problem to rout a click to the loudspeaker but keep the backing track just on the headphones. Anyone have any clapperboard-type tricks, or any advice or workarounds, etc for lining up tracks to defeat latency with collaborators?