massign — Assigns a MIDI channel number to a Csound instrument.


Assigns a MIDI channel number to a Csound instrument.


massign ichnl, insnum[, ireset]
massign ichnl, "insname"[, ireset]


ichnl -- MIDI channel number (1-16).

insnum -- Csound orchestra instrument number. If zero or negative, the channel is muted (i.e. it doesn't trigger a csound instrument, though information will still be received by opcodes like midiin).

insname -- A string (in double-quotes) representing a named instrument.

ireset -- If non-zero resets the controllers; default is to reset.


Assigns a MIDI channel number to a Csound instrument. Also useful to make sure a certain instrument (if its number is from 1 to 16) will not be triggered by midi noteon messages (if using something midiin to interpret midi information). In this case set insnum to 0 or a negative number.

If ichan is set to 0, the value of insnum is used for all channels. This way you can route all MIDI channels to a single Csound instrument. You can also disable triggering of instruments from MIDI note events from all channels with the following line:

massign 0,0

This can be useful if you are doing all MIDI evaluation within Csound with an always on instrument(e.g. using midiin and turnon) to avoid doubling the instrument when a note is played.

See Also



Author: Barry L. Vercoe - Mike Berry
MIT, Cambridge, Mass.

New in Csound version 3.47

ireset parameter new in Csound5

Thanks goes to Rasmus Ekman for pointing out the correct MIDI channel range.