Love the idea. As the device is recording all MIDI events, you can use it for any device with MIDI output (synth, drums, etc.). Are you envisioning expanding the app usage for other instruments than piano? (Would be great for drumming for instance)
+1 for this, I may end up buying this anyway but aside from the piano I have a Arturia Keystep Pro hooked up to a few synths that can sequence 4 channels, would be amazing to have this work with that setup and record all the midi channels and be able to select the channels in the app.
