Note-on event specific data. Used in \ref Event (union)
< channel index in event bus
< in sample frames (optional, Note Off has to follow in any case!)
< note identifier (if not available then -1)
< range [0, 127] = [C-2, G8] with A3=440Hz
< 1.f = +1 cent, -1.f = -1 cent
< range [0.0, 1.0]
See Implementation
Note-on event specific data. Used in \ref Event (union)