The following opcodes can receive MIDI information:
MIDI information for any instruments: aftouch, chanctrl and polyaft, pchbend
MIDI information for MIDI-triggered instruments: veloc, midictrl, midichn and notnum See also Converters
MIDI Controller input for any instrument: ctrl7, ctrl14 and ctrl21
MIDI Controller input for MIDI-triggered instruments only: midic7, midic14 and midic21
MIDI controller value initialization: initc7, initc14, initc21 and ctrlinit
Generic MIDI input: midiin
massign can be used to specify the csound instrument to be triggered by a particular MIDI channel. pgmassign can be use to assign a csound instrument to a specific MIDI program.