add polyphony for 1.0

[cclark2a]

This covers multiple pieces of development needed to have true polyphonic support.

• allow multiple notes with different pitches to overlap on same channel when reading, writing MIDI
• assign notes to matched pairs of CV and GATE for as many polyphonic notes as the setup allows
• allow selecting and editing these notes (I have no idea how this will be implemented)

[cclark2a]

Design for selecting and editing:

• select button toggles as now between edit duration/pitch, insert location, extend selection
• vertical wheel for latter two states selects poly note (today it edits selection pitch)
• add note with insert location slides notes over as it does today
• add note with extend selection adds new poly note on top of existing score
• cut note with insert location slides notes back as it does today
• cut note with extend location removes selected notes without affecting rest of score
• storage allows unlimited simultaneous poly notes
• playback recycles notes as needed limited by user selectable poly channel count (up to 16)

[cclark2a]

Revised midi parsing to handle polyphony (only mono midi tested) (1.0.1) Revised engine to play polyphony (only mono tested) (1.0.2)

[cclark2a]

First light: this polyphonic midi file from the wild parsed and played. (1.0.3)

[cclark2a]

Notes can be added, selected, and edited (pitch and duration) to form polyphonic chords and passages.

[cclark2a]

Polyphonic support is complete. Maybe there also needs to be a way to enter polyphonic phrases from external input, but I haven't thought about how that would work, so I'll close this for now.