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MixerClear

Resets all channels of a buss to 0.

Syntax

MixerClear

Performance

Use of the mixer requires that instruments setting gains have smaller numbers than instruments sending signals, and that instruments sending signals have smaller numbers than instruments receiving those signals. However, an instrument may have any number of sends or receives. After the final signal is received, MixerClear must be invoked to reset the busses to 0 before the next kperiod.

Examples

instr 220 ; Master output
    ; It applies a bass enhancement, compression and fadeout
    ; to the whole piece, outputs signals, and clears the mixer.
  a1  MixerReceive 220, 0
  a2  MixerReceive 220, 1
  ; Bass enhancement
  al1 butterlp a1, 100
  al2 butterlp a2, 100
  a1 = al1*1.5 + a1
  a2 = al2*1.5 + a2 

  ; Global amplitude shape
  kenv   linseg 0., p5 / 2.0, p4, p3 - p5, p4, p5 / 2.0, 0.
  a1=a1*kenv
  a2=a2*kenv 

  ; Compression
  a1 dam a1, 5000, 0.5, 1, 0.2, 0.1  
  a2 dam a2, 5000, 0.5, 1, 0.2, 0.1  

  ; Remove DC bias
  a1blocked dcblock     a1
  a2blocked dcblock     a2

  ; Output signals
  outs a1blocked, a2blocked
  MixerClear
endin

Here is a complete example of the Mixerclear opcode. It uses the file Mixer.csd

Complete example of the Mixerclear opcode.
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<CsoundSynthesizer>
<CsOptions>
; Select audio/midi flags here according to platform
; Audio out   Audio in
-odac       ;   -iadc    ;;;RT audio out
; For Non-realtime ouput leave only the line below:
; -o Mixer.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>

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

instr 1

katt    expon 0.01, p3, 1               ;create an attack
aout    poscil .7, 440,1
        MixerSetLevel   1, 3, katt      ;impose attack on the gain level
        MixerSend aout, 1, 3, 0         ;send to channel 0
endin

instr 2

aout    vco2 .5, 110                    ;saw wave
        MixerSetLevel 2, 3, .25         ;set level to .25 of vco2
        MixerSend aout, 2, 3, 1         ;send to channel 1
endin

instr 3 ;mix instr.1 and 2 with reverb

kgain1  MixerGetLevel   1,3             ;get level form buss 3
kgain2  MixerGetLevel   2,3             ;get level form buss 3
a1      MixerReceive    3,0             ;receive channel 0
a2      MixerReceive    3,1             ;receive channel 1
aout    = a1*kgain1+a2*kgain2           ;mix them
aoutL, aoutR reverbsc aout, aout,  0.85, 12000  ;add a nice reverb
        outs  aoutL, aoutR
        MixerClear
endin

</CsInstruments>
<CsScore>
f1 0 4096 10 1

i1 0 2
i2 0 2
i3 0 8  ;reverb stays on for 8 sec.

e
</CsScore>
</CsoundSynthesizer>

See also

Mixer Opcodes

Credits

Author: Michael Gogins (gogins at pipeline dot com).