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 371. 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
    ; Audio out   Audio in
    -odac         ;  -iadc    ;;;RT audio I/O
    ; For Non-realtime ouput leave only the line below:
    ; -o portk.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

    sr = 44100
    ksmps = 128
    nchnls = 1

    ;Example by Andres Cabrera 2007

    FLpanel "Slider", 650, 140, 50, 50
        gkval1, gislider1 FLslider "Watch me", 0, 127, 0, 5, -1, 580, 30, 25, 20
        gkval2, gislider2 FLslider "Move me", 0, 127, 0, 5, -1, 580, 30, 25, 80
        gkhtim, gislider3 FLslider "khtim", 0.1, 1, 0, 6, -1, 30, 100, 610, 10
    FLpanelEnd
    FLrun

    FLsetVal_i 0.1, gislider3 ;set initial time to 0.1

    instr 1
    kval portk gkval2, gkhtim  ; take the value of slider 2 and apply portamento
    FLsetVal 1, kval, gislider1  ;set the value of slider 1 to kval
    endin

    </CsInstruments>
    <CsScore>

    ; Play Instrument #1 for one minute.
    i 1 0 60
    e

    </CsScore>
    </CsoundSynthesizer>

## See Also

areson, aresonk, atone, atonek, port, reson, resonk, tone, tonek

## Credits

Author: Robin Whittle
Australia
May 1997

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