What are the feature and capabilities of a General MIDI device?
Any device that bears the GM logo must adhere to these features: 24 voices of polyphony Respond to all 16 MIDI channels Each channel can access any number of voices Each channel can play a different timbre A full set of percussion instruments on channel 10 All percussion instruments are mapped to specific MIDI note numbers A minimum of 128 presets available as MIDI program numbers All sounds available on all MIDI channels except channel 10 Respond to note on velocity Middle C is always note number 60 All GM devices respond to MIDI controllers 1-modulation, 7-volume, 10-pan, 11-expression, 64-sustain pedal, 121-reset all controllers, 123-all notes off GM devices respond to all registered parameters 0-pitch bend sensitivity, 1-fine tuning, 2-coarse tuning GM devices also respond to channel pressure and pitch bend (two semitone default)
