outch
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## outch

outch — Writes multi-channel audio data, with user-controllable channels, to an external device or stream.

## Description

Writes multi-channel audio data, with user-controllable channels, to an external device or stream.

## Syntax

    outch kchan1, asig1 [, kchan2] [, asig2] [...]

## Performance

outch outputs asig1 on the channel determined by kchan1, asig2 on the channel determined by kchan2, etc.

| Note
The highest number for kchanX available for use with outch depends on nchnls. If kchanX is greater than nchnls, asigX will be silent. Note that outch will give a warning but not an error in this case.

## Examples

Here is an example of the outch opcode. It uses the file outch.csd.

Example 669. Example of the outch 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
    -odac    ;;;realtime audio out
    ;-iadc    ;;;uncomment -iadc if realtime audio input is needed too
    ; For Non-realtime ouput leave only the line below:
    ; -o outch.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

    sr = 44100
    ksmps = 32
    nchnls = 5
    0dbfs  = 1

    instr 1

    asig vco2 .05, 100	; sawtooth waveform at low volume

    kcut line 100, p3, 30	; Vary cutoff frequency
    kresonance = .7
    inumlayer = 3
    asig lowresx asig, kcut, kresonance, inumlayer

    klfo lfo 4, .5, 4
    klfo = klfo+1		; offset of 1
    printks "signal is sent to channel %d\\n", .1, klfo
          outch klfo,asig

    endin
    </CsInstruments>
    <CsScore>

    i 1 0 30
    e
    </CsScore>
    </CsoundSynthesizer>

    signal is sent to channel 5
    signal is sent to channel 4
    signal is sent to channel 3
    signal is sent to channel 2
    signal is sent to channel 1
    signal is sent to channel 5
    ........

Here is another example of the outch opcode. It uses the file outch-2.csd.

Example 670. Another example of the outch opcode.

    <CsoundSynthesizer>
    <CsOptions>
    ; Select audio/midi flags here according to platform
    -odac      ;;;realtime audio out
    ;-iadc    ;;;uncomment -iadc if realtime audio input is needed too
    ; For Non-realtime ouput leave only the line below:
    ; -o outch-2.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

    sr = 44100
    ksmps = 32
    nchnls = 4
    0dbfs  = 1

    seed     0

    instr 1 ;random movements between 4 speakers with outch

    ichn1     random    1, 4.999 ;channel to start
    ichn2     random    1, 4.999 ;channel to end
              prints    "Moving from speaker %d to speaker %d%n", int(ichn1), int(ichn2)
    asamp     soundin   "fox.wav"
    kmov      linseg    0, p3, 1
    a1, a2    pan2      asamp, kmov
              outch     int(ichn1), a1, int(ichn2), a2
    endin

    </CsInstruments>
    <CsScore>
    r 5
    i 1 0 3
    e
    </CsScore>
    </CsoundSynthesizer>

## See Also

out32, outc, outx, outz

More information on this opcode: http://www.csoundjournal.com/issue16/audiorouting.html , written by Andreas Russo

## Credits

Author: John ffitch
University of Bath/Codemist Ltd.
Bath, UK
May 2000

New in Csound Version 4.07

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