Also fails if I turn it off then back on. I can see the trigger indications on the display, and everything seems right electronically, but no sound comes out. If I turn it off for an hour and come back, it works. And recently, my 2 crash cymbals wont trigger if I hit the snare at the exact same time - this happens even if I use factory kits that I haven't screwed with.
InMusic support wasn't helpful as the unit is out of warranty. Any thoughts? I have done the trigger calibration etc, as per the Alesis video. Purchased the unit used in May 2016.