Working testtone app is a nice indicator - you're getting there. Now take one step at a time. Do you _know_ you midi keyboard or whatever you use is actually correctly sending out MIDI Notes on Channel 1? You could check that by running it into your PC and using MIOS Studio's input monitor to check the messages received. If that doesn't solve it, recheck the wiring once more. Take a close look at the schematics on ucapps.de and make sure you don't miss any of the subtle, small, tiny, semi-hidden wires ;)