gainslider
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## gainslider

gainslider — An implementation of a logarithmic gain curve which is similar to the gainslider~ object from Cycling 74 Max / MSP.

## Description

This opcode is intended for use to multiply by an audio signal to give a console mixer like feel. There is no bounds in the source code so you can for example give higher than 127 values for extra amplitude but possibly clipped audio.

## Syntax

    kout gainslider kindex

## Performance

kindex -- Index value. Nominal range from 0-127. For example a range of 0-152 will give you a range from -∞ to +18.0 dB.

kout -- Scaled output.

## Examples

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

Example 401. Example of the gainslider opcode.

See the sections Real-time Audio and Command Line Flags for more information on using command line flags.

    <CsoundSynthesizer>
    <CsOptions>
    ; Select audio/midi flags here according to platform
    ; Audio out   Audio in    Silent
    -odac           -iadc     -d    ;;;realtime output
    </CsOptions>
    <CsInstruments>

    sr	=	48000
    ksmps	=	100
    nchnls	=	2

    		instr	1	; gainslider test

    ; uncomment for realtime midi
    ;kmod	ctrl7	1, 1, 0, 127

    ; uncomment for non realtime
    km0d phasor 1/10
    kmod scale km0d, 127, 0

    kout	gainslider	kmod

    	printks	"kmod = %f  kout = %f\\n", 0.1, kmod, kout

    aout	diskin2	"fox.wav", 1, 0, 1

    aout	=	aout*kout

    	outs	aout, aout

    		endin

    </CsInstruments>
    <CsScore>
    i1	0	30
    e
    </CsScore>
    </CsoundSynthesizer>

## See Also

scale, logcurve, expcurve

## Credits

Author: David Akbari
October
2006

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