trigexpseg

Triggers a series of exponential segments between specified points.

Syntax

ares trigexpseg kTrig, ia, idur1, ib [, idur2] [, ic] [...]
kres trigexpseg kTrig, ia, idur1, ib [, idur2] [, ic] [...]

Initialization

ia -- starting value. Zero is illegal for exponentials.

ib, ic, etc. -- value after dur1 seconds, etc. For exponentials, must be non-zero and must agree in sign with ia.

idur1 -- duration in seconds of first segment

idur2, idur3, etc. -- duration in seconds of subsequent segments.

Performance

kTrig -- trigger value. Will trigger playback of envelop when kTrig is equal 1

These units generate control or audio signals whose values can pass through 2 or more specified points. The sum of dur values may or may not equal the instrument's performance time: a shorter performance will truncate the specified pattern. Triggering the envelop while it is already playing will cause the envelop to jump to the start and play again. This might cause a pop or a click. It is best to wait till the envelope has ended before retriggering it.

Examples

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

<CsoundSynthesizer>
<CsOptions>
; Select audio/midi flags here according to platform
; Audio out   Audio in    No messages
-odac   -d    -m0d     -M0  -+rtmidi=virtual ;;;RT audio I/O with MIDI in
; For Non-realtime ouput leave only the line below:
; -o midiin.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>
sr = 44100
ksmps = 32
nchnls = 2
0dbfs = 1

instr 1
aEnv expseg 0.0001, .2, 1, .2, .5, .2, .7, .2, 0.0001
a1 oscili aEnv, 400
outs a1, a1
endin

instr 2
kTrig metro 1
aEnv trigexpseg kTrig, 0.0001, .2, 1, .2, .5, .2, .7, .2, 0.0001
a1 oscili aEnv, 400
outs a1, a1
endin

</CsInstruments>
<CsScore>
i1 0 1
i2 3 8
</CsScore>
</CsoundSynthesizer>

See also

Linear and Exponential Generators

Credits

Author: Rory Walsh
2021