loopsegp — Control signals based on linear segments.
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.
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.
Here is an example of the loopsegp opcode. It uses the file loopsegp.csd.
Example 438. 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>