MixerClear
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## MixerClear

MixerClear — Resets all channels of a buss to 0.

## Syntax

                MixerClear

## Description

Resets all channels of a buss to 0.

## 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

Example 623. Complete example of the Mixerclear opcode.

    <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>

## Credits

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

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