Utterly brilliant - where did my time go!
Feature request please - mute and randomize (at least) would sound great if you could pre-sync them with the repeat. I found myself trying to judge how much lag there is before they kick in. It would be great if you could just line up one or more before the repeat - which is where you will want them 99%. Maybe a check box option.
You have a fantastic performance application right now, please don't get drawn into making a sequencer and losing all the fun.