I have perused the manual and clicked all over the app but I do not see any way to set the MIDI channel. One way I operate is to set up several synth apps with background mode on and each app responding to a different MIDI channel. All I need to do is set the MIDI transmit channel on my controller and, voila, a new sound is ready to go. In every other synth app, I have been able to find and get the MIDI receive channel but not for iMini. I hope I'm not crazy and missing where it is set.