loopsegp
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## loopsegp

loopsegp — Control signals based on linear segments.

## Description

Generate control signal consisiting of linear segments delimited by two or more specified points. The entire envelope can be looped at time-variant rate. Each segment coordinate can also be varied at k-rate.

## Syntax

    ksig loopsegp  kphase, kvalue0, kdur0, kvalue1 \
          [, kdur1, ... , kdurN-1, kvalueN]

## Performance

ksig - output signal

kphase - point of the sequence read, expressed as a fraction of a cycle (0 to 1)

kvalue0 ...kvalueN - values of points

kdur0 ...kdurN-1 - duration of points expessed in fraction of a cycle

loopsegp opcode is similar to loopseg; the only difference is that, instead of frequency, a time-variant phase is required. If you use phasor to get the phase value, you will have a behaviour identical to loopseg, but interesting results can be achieved when using phases having non-linear motions, making loopsegp more powerful and general than loopseg.

## Examples

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

Example 511. Example of the loopsegp opcode.

    <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 loopsegp.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

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

    instr 1
    ktrig metro 22/8 ; triggers used to generate new direction values
    kdir  trandom ktrig,-2.99,2.99
    kdir  =       0.5*int(kdir) ; kdir will either -1, -0.5, 0, 0.5 or 1
    ; kphase - looping pointer
    kphase phasor kdir
    ; a loop sequence of midi note numbers and durations
    knote loopsegp  kphase, 40,1,40,0, 43,1,43,0, 49,2,48,0, \
     47,1,47,0, 46,1,46,0, 46,1,47,0, 49,1,49,0, 43,1,43,0, 46,1,46,0, 40,1,39,0
    kmul  rspline 0.1,0.8,0.5,5                         ; modulation of buzz tone
    asig  gbuzz   0.2, cpsmidinn(knote), 30, 3, kmul, 1 ; buzz tone
          outs    asig, asig

          schedkwhen ktrig,0,0,2,0,0.1 ; play metronome
    endin

    instr 2 ; metronome
    acps  expon   180+rnd(40),p3,50
    aamp  expon   0.05+rnd(0.05),p3,0.001
    asig  poscil  aamp-0.001,acps,2
          outs    asig,asig
    endin

    </CsInstruments>
    <CsScore>
    ; cosine wave.
    f 1 0 16384 11 1
    ; sine wave.
    f 2 0 16384 10 1

    i 1 0 360 0.25

    e
    </CsScore>
    </CsoundSynthesizer>

## Credits

Written by Gabriel Maldonado.

New in Csound 5. (Previously available only on CsoundAV)

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