portk
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## portk

portk — Applies portamento to a step-valued control signal.

## Description

Applies portamento to a step-valued control signal.

## Syntax

    kres portk ksig, khtim [, isig]

## Initialization

isig (optional, default=0) -- initial (i.e. previous) value for internal feedback. The default value is 0.

## Performance

kres -- the output signal at control-rate.

ksig -- the input signal at control-rate.

khtim -- half-time of the function in seconds.

portk is like port except the half-time can be varied at the control rate.

## Examples

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

Example 779. Example of the portk 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 portk.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

    ; by Stefano Cucchi 2020

    sr = 44100
    ksmps = 32
    0dbfs  = 1
    nchnls = 2

    instr 1

    kFreq randomh 400, 1300, 4, 2, 550 ; random frequency to oscillators.

    khtim linseg 0.001, p3*0.3, 0.001, p3*0.7, 0.125 ; portamento-function: start with NO portamento - then portamento.
    kPort portk kFreq, khtim ; pitch with portamento.

    asigL oscili 0.4, kFreq, 1 ; channel left - NO portamento.
    asigR oscili 0.4, kPort, 2 ; channel right - PORTAMENTO.

    outch 1, asigL   ; channel left
    outch 2, asigR   ; channel right

    endin

    </CsInstruments>
    <CsScore>

    f 1 0 4096 10 1 0 1 0 1 0 1 0 1
    f 2 0 4096 10 1 1 0 1 0 1 0 1 0 1

    i 1 0 10
    e
    </CsScore>
    </CsoundSynthesizer>

## See also

Standard Filters: Control signal filters

## Credits

Author: Robin Whittle
Australia
May 1997

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