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- MIDI + Instrument Patch
Map + Percussion Key Map -> a piece of MIDI music sounds the same
anywhere it is played
- Instrument patch map is a standard program list consisting of 128 patch types.
- Percussion map specifies 47 percussion sounds.
- Key-based percussion is always transmitted on MIDI channel 10.
- Requirements for General MIDI Compatibility:
- Support all 16 channels.
- Each channel can play a different instrument/program (multitimbral).
- Each channel can play many voices (polyphony).
- Minimum of 24 fully dynamically allocated voices.