midichn
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## midichn

midichn — Returns the MIDI channel number from which the note was activated.

## Description

midichn returns the MIDI channel number (1 - 16) from which the note was activated. In the case of score notes, it returns 0.

## Syntax

    ichn midichn

## Initialization

ichn -- channel number. If the current note was activated from score, it is set to zero.

## Examples

Here is a simple example of the midichn opcode. It uses the file midichn.csd.

Example 291. Example of the midichn opcode.

See the sections Real-time Audio and Command Line Flags for more information on using command line flags.

    <CsoundSynthesizer>
    <CsOptions>
    ; Select audio/midi flags here according to platform
    ; Audio out   Audio in   No messages  MIDI in
    -odac           -iadc     -d         -M0  ;;;RT audio I/O with MIDI in
    ; For Non-realtime ouput leave only the line below:
    ; -o midichn.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

    ; Initialize the global variables.
    sr = 44100
    kr = 4410
    ksmps = 10
    nchnls = 1

    ; Instrument #1.
    instr 1
      i1 midichn

      print i1
    endin

    </CsInstruments>
    <CsScore>

    ; Play Instrument #1 for 12 seconds.
    i 1 0 12
    e

    </CsScore>
    </CsoundSynthesizer>

Here is an advanced example of the midichn opcode. It uses the file midichn_advanced.csd.

Don't forget that you must include the -F flag when using an external MIDI file like “midichn_advanced.mid”.

Example 292. An advanced example of the midichn opcode.

    <CsoundSynthesizer>
    <CsOptions>
    ; Select audio/midi flags here according to platform
    ; Audio out   Audio in   No messages  MIDI in
    -odac           -iadc     -d         -M0  ;;;RT audio I/O with MIDI in
    ; For Non-realtime ouput leave only the line below:
    ; -o midichn_advanced.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

    sr	=  44100
    ksmps	=  10
    nchnls	=  1

    	massign  1, 1		; all channels use instr 1
    	massign  2, 1
    	massign  3, 1
    	massign  4, 1
    	massign  5, 1
    	massign  6, 1
    	massign  7, 1
    	massign  8, 1
    	massign  9, 1
    	massign 10, 1
    	massign 11, 1
    	massign 12, 1
    	massign 13, 1
    	massign 14, 1
    	massign 15, 1
    	massign 16, 1

    gicnt	=  0			; note counter

    	instr 1

    gicnt	=  gicnt + 1	; update note counter
    kcnt	init gicnt	; copy to local variable
    ichn	midichn		; get channel number
    istime	times		; note-on time

    	if (ichn > 0.5) goto l2		; MIDI note
    	printks "note %.0f (time = %.2f) was activated from the score\\n", \
    		3600, kcnt, istime
    	goto l1
    l2:
    	printks "note %.0f (time = %.2f) was activated from channel %.0f\\n", \
    		3600, kcnt, istime, ichn
    l1:
    	endin

    </CsInstruments>
    <CsScore>

    t 0 60
    f 0 6 2 -2 0
    i 1 1 0.5
    i 1 4 0.5
    e

    </CsScore>
    </CsoundSynthesizer>

Its output should include lines like:

    note 7 (time = 0.00) was activated from channel 4
    note 8 (time = 0.00) was activated from channel 2

## See Also

pgmassign

## Credits

Author: Istvan Varga
May 2002

The simple example was written by Kevin Conder.

New in version 4.20

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