The jog wheel concept is cool. Slow, but nifty. Project change mode seems fine, while 'Change Instrument Menu Mode' could pop up a simple GUI page listing sample load slots for each channel, with the loaded sample listed and a search file folder section for previewing samples on the fly. It'd be Visually quicker and it would solve a couple issues relating to previewing samples quickly to build a kit.
The select button could still choose the instrument to be changed, while the jog wheel scans through the instrument list.
Or am I just missing that it already does this somehow...