149 lines
2.8 KiB
Text
149 lines
2.8 KiB
Text
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#lang scribble/manual
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@(require (for-label racket))
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@title{VarLag}
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Variable shaped lag@section{related}
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Classes/Lag, Classes/Ramp, Classes/Slew
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@section{categories}
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UGens>Filters>Linear
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@section{description}
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Similar to link::Classes/Lag:: but with other curve shapes than exponential.
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A change on the input will take the specified time to reach the new value.
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Useful for smoothing out control signals.
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@section{classmethods}
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@section{method}
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ar, kr
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@section{argument}
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in
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The input signal.
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@section{argument}
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time
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Lag time in seconds.
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@section{argument}
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curvature
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Control curvature if strong::warp:: input is 5 (default).
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0 means linear, positive and negative numbers curve the segment up and down.
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@section{argument}
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warp
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Determines the shape. The possible values are:
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@section{table}
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##
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@racketblock[\step:: || || flat segment
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## ]
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@racketblock[\linear:: || ]
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@racketblock[\lin:: || linear segment, the default
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## ]
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@racketblock[\exponential:: || ]
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@racketblock[\exp:: || natural exponential growth and decay. In this case, the levels must all be nonzero and the have the same sign.
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## ]
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@racketblock[\sine:: || ]
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@racketblock[\sin:: || sinusoidal S shaped segment.
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## ]
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@racketblock[\welch:: || ]
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@racketblock[\wel:: || sinusoidal segment shaped like the sides of a Welch window.
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## ]
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@racketblock[\squared:: || ]
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@racketblock[\sqr:: || squared segment
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## ]
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@racketblock[\cubed:: || ]
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@racketblock[\cub:: || cubed segment
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::
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All values above will ignore strong::curvature:: input.
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]
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@section{note}
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When controlling this from the outside, use
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@racketblock[Env.shapeNumber(symbol):: to get the numeric value for each shape.
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::
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]
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@section{argument}
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start
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Initial value. If not specified, same as the input signal.
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@section{argument}
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mul
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Output will be multiplied by this value.
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@section{argument}
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add
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This value will be added to the output.
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@section{Examples}
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@racketblock[
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(
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// used to lag pitch
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{
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SinOsc.ar( // sine wave
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VarLag.kr( // lag the modulator
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LFPulse.kr(1).range(100,400), // frequency modulator
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0.2, // lag time
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Line.kr(-8, 8, 15, doneAction: Done.freeSelf) // modulate shape
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),
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0, // sine phase
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0.3 // sine amplitude
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)
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}.play
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)
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::
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]
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@racketblock[
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(
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x = play { |amp=0, time=0, curve=0, warp=5|
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PinkNoise.ar(VarLag.kr(amp, time, curve, warp) ! 2)
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}
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)
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x.set(\amp, 1, \time, 5, \warp, Env.shapeNumber(\sin)) // s-shaped curve up
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x.set(\amp, 0, \time, 1, \warp, Env.shapeNumber(\lin)) // linear down
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x.set(\amp, 1, \time, 2, \warp, 5, \curve, 7); // slow curvature
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x.set(\amp, 0, \time, 0);
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x.set(\amp, 1, \time, 2, \warp, 5, \curve, -7); // fast curvature
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x.set(\amp, 0, \time, 0);
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x.free;
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::
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]
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