MIDI touchpad piano class

[gwilherm]

Hello, I wrote a class to control a touchpad piano module. That class can have 3 different behaviours:

• Standard (default): polyphonic touch and release
• Hold: polyphonic touch and hold
• Monodic: one note at the same time (higher prevails)

A demo: https://www.youtube.com/watch?v=TpfqNea4UTI

I tried to write unit tests but I don't know GTest so I failed