Hi,
I have been looking for some simple ways to make the project more interactive, at the moment I am using an LDR as a gate for each channel - cover one more more LDRs with your finger and those channels are muted, it allows you to mess with the beat or single out one channel, three channels of whatever combination you want.
Another thing I want to do is explore more of the voices and effects that are possible.
Duane B