Basically, I've set up a 'grid' of 16 drums kits with 8 pads each. When I whack on one of the 8 drum pads, the IAC driver diverts that MIDI note on to the appropriate sample. There are 8 samples in each scene, so each scene makes up a drum kit.
Now to switch to another kit, just activate a pitch device. Transposing +1 will access Kit 2, +2 Kit 3, etc. Either let the kit choose itself when you launch the scene, or assign a MIDI or keymap to it.
My last problem is how to make sure all of the pitch shifts are off before turning one on. For this system to work, only 1 of the 15 pitch shifters can be on at a time. If there's a way to make sure they're all off before launching the new clip, that would work.
If anyone can figure that last one out, let me know!

