Hi,
Answers are:
1) Afraid drum is currently locked to channel 1. When I convert the software to use the new libraries, MIDI channel change will be possible
2) Yeah you'll either need to turn off sync, or clear the pattern in memory. It will always start when it receives a clk start message
3) At the moment there's nothing - I wanted every byte possible for drum sample memory, so stripped everything out. I may see if I can add some again when I convert to the new libraries, which uses more efficient code.