The Alternative Csound Reference Manual
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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 ksig, kndx

## Performance

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

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

zkw writes ksig into the zk variable specified by kndx.

## Examples

Here is an example of the zkw opcode. It uses the files zkw.orc and zkw.sco.

Example 1. Example of the zkw opcode.

    /* zkw.orc */
    ; 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
    /* zkw.orc */

    /* zkw.sco */
    ; 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
    /* zkw.sco */

## See Also

zaw, zawm, ziw, ziwm, zkr, zkwm

## Credits

Author: Robin Whittle
Australia
May 1997

Example written by Kevin Conder.

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