zkw
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## zkw

zkw — Writes to a zk variable at k-rate without mixing.

## Description

Writes to a zk variable at k-rate without mixing.

## Syntax

    zkw kval, kndx

## Performance

kval -- value to be written to the zk location.

kndx -- points to the zk location to which to write.

zkw writes kval into the zk variable specified by kndx.

## Examples

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

Example 1262. Example of the zkw 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
    -odac           -iadc     -d     ;;;RT audio I/O
    ; For Non-realtime ouput leave only the line below:
    ; -o zkw.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

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

    ; Initialize the ZAK space.
    ; Create 1 a-rate variable and 1 k-rate variable.
    zakinit 1, 1

    ; Instrument #1 -- a simple waveform.
    instr 1
      ; Linearly vary a k-rate signal from 100 to 1,000.
      kline line 100, p3, 1000

      ; Add the linear signal to zk variable #1.
      zkw kline, 1
    endin

    ; Instrument #2 -- generates audio output.
    instr 2
      ; Read zk variable #1.
      kfreq zkr 1

      ; Use the value of zk variable #1 to vary
      ; the frequency of a sine waveform.
      a1 oscil 20000, kfreq, 1

      ; Generate the audio output.
      out a1

      ; Clear the zk variables, get them ready for
      ; another pass.
      zkcl 0, 1
    endin

    </CsInstruments>
    <CsScore>

    ; Table #1, a sine wave.
    f 1 0 16384 10 1

    ; Play Instrument #1 for two seconds.
    i 1 0 2
    ; Play Instrument #2 for two seconds.
    i 2 0 2
    e

    </CsScore>
    </CsoundSynthesizer>

## See also

Zak Patch System

## Credits

Author: Robin Whittle
Australia
May 1997

New in version 3.45

Example written by Kevin Conder.

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