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< p class = "p1" > < span class = "s1" > < b > SwitchDelay< span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < / b > < / span > < b > feedback delay line implementing switch-and-ramp buffer jumping< / b > < / p >
< p class = "p2" > < br > < / p >
< p class = "p1" > < b > SwitchDelay.ar(input, drylevel, wetlevel, delaytime, delayfactor, maxdelaytime, mul, add)< / b > < / p >
< p class = "p2" > < br > < / p >
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< p class = "p1" > A feedback delay line which allows moving the buffer read position using the switch-and-ramp technique< / p >
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< p class = "p1" > as described by Miller S. Puckette in his Theory and Techniques of Electronic Music book.< / p >
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< p class = "p3" > < span class = "s2" > < a href = "http://crca.ucsd.edu/~msp/techniques/latest/book.pdf" > http://crca.ucsd.edu/~msp/techniques/latest/book.pdf< / a > < / span > < span class = "s3" > (chapter 4)< / span > < / p >
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< p class = "p2" > < br > < / p >
< p class = "p1" > Altering the buffer read position, in order to affect the perceived delay speed/timing, creates a< span class = "Apple-converted-space" > < / span > < / p >
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< p class = "p1" > discontinuity in the signal, typically causing unwanted audible artefacts. The switch-and-ramp technique seeks to neutralise these artefacts and allow switching with minimal clicks. See examples.< / p >
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< p class = "p2" > < br > < / p >
< p class = "p1" > < b > input< / b > - a signal to be filtered< / p >
< p class = "p1" > < b > drylevel< / b > - level of dry signal (default: 1.0)< / p >
< p class = "p1" > < b > wetlevel< / b > - level of delayed signal (default: 1.0)< / p >
< p class = "p1" > < b > delaytime< / b > - seconds to delay signal (default: 1.0)< / p >
< p class = "p1" > < b > delayfactor< / b > - multiplier for feedback level, affects the length of the feedback tail (default 0.7)< / p >
< p class = "p1" > < span class = "Apple-converted-space" > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < / span > limited slightly below 1.0 to avoid speaker damaging mistakes< / p >
< p class = "p1" > < b > maxdelaytime< / b > - buffer size (default 20.0)< / p >
< p class = "p2" > < br > < / p >
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< p class = "p1" > < b > < span class = "Apple-converted-space" > < / span > See also:< / b > < a href = "../../../../Applications/SuperCollider3/build/Help/UGens/Delays/CombN.html" > < span class = "s4" > CombN< / span > < / a > < span class = "s4" > < / span > etc< / p >
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< p class = "p4" > < br > < / p >
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< p class = "p5" > < br > < / p >
< p class = "p6" > // before anything else< / p >
< p class = "p7" > s = < span class = "s5" > Server< / span > .local.boot;< / p >
< p class = "p8" > < span class = "s3" > b = < / span > < span class = "s5" > Buffer< / span > < span class = "s3" > .read(s, < / span > "sounds/a11wlk01.wav"< span class = "s3" > );< / span > < / p >
< p class = "p5" > < br > < / p >
< p class = "p6" > // simple feedback delay< / p >
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< p class = "p7" > (< / p >
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< p class = "p7" > < span class = "s5" > SynthDef< / span > (< span class = "s6" > 'help-switchdelay-1'< / span > , { < span class = "s5" > arg< / span > out=0, bufnum;< / p >
< p class = "p7" > < span class = "Apple-tab-span" > < / span > < span class = "s5" > Out< / span > .ar(out,< / p >
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< p class = "p7" > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > Pan2.ar(< / p >
< p class = "p9" > < span class = "s3" > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < / span > SwitchDelay< span class = "s3" > .ar(< / span > < / p >
< p class = "p7" > < span class = "s5" > < span class = "Apple-tab-span" > < / span > < / span > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < span class = "s5" > PlayBuf< / span > .ar(numChannels: 1, bufnum: bufnum, loop: 0) * 0.5,< / p >
< p class = "p7" > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > delaytime: 0.4,< / p >
< p class = "p7" > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > delayfactor: 0.6,< / p >
< p class = "p7" > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > wetlevel: 0.7< / p >
< p class = "p7" > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > )< / p >
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< p class = "p7" > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > )< / p >
< p class = "p7" > < span class = "Apple-tab-span" > < / span > );< / p >
< p class = "p7" > }).send(s);< / p >
< p class = "p7" > )< / p >
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< p class = "p5" > < br > < / p >
< p class = "p10" > < span class = "s3" > x = < / span > < span class = "s5" > Synth< / span > < span class = "s3" > (< / span > 'help-switchdelay-1'< span class = "s3" > , [< / span > \bufnum< span class = "s3" > , b]);< / span > < / p >
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< p class = "p7" > x.free;< / p >
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< p class = "p5" > < br > < / p >
< p class = "p5" > < br > < / p >
< p class = "p6" > // this time, change the buffer read pointer periodically.< / p >
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< p class = "p7" > (< / p >
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< p class = "p7" > < span class = "s5" > SynthDef< / span > (< span class = "s6" > 'help-switchdelay-2'< / span > , { < span class = "s5" > arg< / span > out=0, bufnum, delaytime;< / p >
< p class = "p7" > < span class = "Apple-tab-span" > < / span > < span class = "s5" > Out< / span > .ar(out,< / p >
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< p class = "p7" > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > Pan2.ar(< / p >
< p class = "p9" > < span class = "s3" > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < / span > SwitchDelay< span class = "s3" > .ar(< / span > < / p >
< p class = "p7" > < span class = "s5" > < span class = "Apple-tab-span" > < / span > < / span > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < span class = "s5" > PlayBuf< / span > .ar(numChannels: 1, bufnum: bufnum, loop: 0) * 0.5,< / p >
< p class = "p7" > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > wetlevel: 0.6,< / p >
< p class = "p7" > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > delaytime: < span class = "s5" > Select< / span > .kr(< / p >
< p class = "p7" > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < span class = "s5" > Stepper< / span > .kr(< span class = "s5" > Impulse< / span > .kr(0.5), 0, 0, 3),< / p >
< p class = "p7" > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > #[ 0.02, 0.1, 0.725, 0.25 ]< span class = "Apple-converted-space" > < / span > < / p >
< p class = "p7" > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > )< / p >
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< p class = "p7" > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > )< / p >
< p class = "p7" > < span class = "Apple-tab-span" > < / span > < span class = "Apple-tab-span" > < / span > )< / p >
< p class = "p7" > < span class = "Apple-tab-span" > < / span > );< / p >
< p class = "p7" > }).send(s);< / p >
< p class = "p7" > )< / p >
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< p class = "p5" > < br > < / p >
< p class = "p10" > < span class = "s3" > x = < / span > < span class = "s5" > Synth< / span > < span class = "s3" > (< / span > 'help-switchdelay-2'< span class = "s3" > , [< / span > \bufnum< span class = "s3" > , b, < / span > \loop< span class = "s3" > , 0, < / span > \delaytime< span class = "s3" > , 2.0]);< / span > < / p >
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< p class = "p7" > x.free;< / p >
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< p class = "p5" > < br > < / p >
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