Use your Rock Band 3 Keytar or Drum Kit as a MIDI controller - wirelessly! Connect a controller, start the program, select the controller and the output MIDI device and start shredding.
I suggest installing LoopBe1 if you want to use this as a midi controller for e.g. a DAW.
Use the left and right D-pad controlls to switch octaves.
No touchpad support, yet. I can't find touchpad data in any of the Xinput structs.
The drums are output on MIDI channel 10. Currently the MIDI notes are fixed and assume you have the Pro Cymbals attached.
Windows (.NET 4.7 exe):