Keyboard: MIDI Thru Support #6
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This PR adds MIDI Thru support for simplifying connectivity. On the hardware side you connect VCC/GND/ TX->RX. It should support an arbitrary number of keyboards, at the moment I only have two.
To simplify implementation I added the FortySevenEffects MIDI library which lets you use Serial + USB devices with the same interface. Internally it uses the same MIDI-USB library support class compliant MIDI.
Here's a short demo to see it in action:
