portk — Applies portamento to a step-valued control signal.
isig (optional, default=0) -- initial (i.e. previous) value for internal feedback. The default value is 0.
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.
Here is an example of the portk opcode. It uses the file portk.csd.
Example 332. 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>