Embeddable Software MIDI Player for Godot Engine 3.1 and later.
1.5 new features:
* added reverb, chorus and panning
* receive raw midi message
* implemented vel_range and instrument has multiple sample.
* Play Standard MIDI File format 0 and format 1 with SoundFont.
* Emit signals on some MIDI events (changes tempo, lyrics, markers or something).
* Receive raw midi messages