brconflict
 
Does that work well with sample buffering? I'd question the latency of the click to the actual recording takes place.

It sure seems plenty responsive. Give it a try. Even if your latency is something like 20 ms, it's hard to imagine you could click with an accuracy that fits in a 20 ms window.
 
Did tape recorders need a relay to close or open to go into record? That would take a certain amount of time.

Has anyone used take lanes and comping to stitch together a stereo part, i.e. using different takes to create a left part and a right part with subtle differences? I'm experimenting with my 15 takes of a 32-bar part, and it occurred to me that I could probably get two decent parts from those 15 takes by cloning the track and comping it again but using different slices this time. Of course I could just record another 15 takes and comp those into a new part, but I figured why bother getting my guitar out when I already have all those slices of takes going unused - many of which were perfectly good? It's a time consuming process but doable.