chnmix — Writes audio data to the named software bus, mixing to the previous output.
Adds an audio signal to a channel of the named software bus. Implies declaring the channel with imode=2 (see also chn_a).
Here is an example of the chnmix opcode. It uses the file chnmix.csd.
Example 114. Example of the chnmix 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 chnmix.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> ;Example by Joachim Heintz sr = 44100 ksmps = 32 nchnls = 2 0dbfs = 1 instr 1; send i-values chnset 1, "sio" chnset -1, "non" endin instr 2; send k-values kfreq randomi 100, 300, 1 chnset kfreq, "cntrfreq" kbw = kfreq/10 chnset kbw, "bandw" endin instr 3; send a-values anois rand .1 chnset anois, "noise" loop: idur random .3, 1.5 timout 0, idur, do reinit loop do: ifreq random 400, 1200 iamp random .1, .3 asig oscils iamp, ifreq, 0 aenv transeg 1, idur, -10, 0 asine = asig * aenv chnset asine, "sine" endin instr 11; receive some chn values and send again ival1 chnget "sio" ival2 chnget "non" print ival1, ival2 kcntfreq chnget "cntrfreq" kbandw chnget "bandw" anoise chnget "noise" afilt reson anoise, kcntfreq, kbandw afilt balance afilt, anoise chnset afilt, "filtered" endin instr 12; mix the two audio signals amix1 chnget "sine" amix2 chnget "filtered" chnmix amix1, "mix" chnmix amix2, "mix" endin instr 20; receive and reverb amix chnget "mix" aL, aR freeverb amix, amix, .8, .5 outs aL, aR endin instr 100; clear chnclear "mix" endin </CsInstruments> <CsScore> i 1 0 20 i 2 0 20 i 3 0 20 i 11 0 20 i 12 0 20 i 20 0 20 i 100 0 20 </CsScore> </CsoundSynthesizer>