Midi Channel Change using sensoreware app

I would like to request the option for the Freedrums to have the capability to change midi channel like in those keyboard midi controller to control one app with the same midi channel. I want to play the freedrum with a friend who has a midi keyboard. The midi keyboard triggers a piano app and I can trigger a drums app . If you already can change the midi channel let me know as I want to use two midi device.Thanks