98 lines
2.5 KiB
Text
98 lines
2.5 KiB
Text
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class:: VarLag
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summary:: Variable shaped lag
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related:: Classes/Lag, Classes/Ramp, Classes/Slew
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categories:: UGens>Filters>Linear
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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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classmethods::
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method::ar, kr
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argument::in
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The input signal.
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argument::time
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Lag time in seconds.
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argument::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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argument::warp
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Determines the shape. The possible values are:
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table::
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## code::\step:: || || flat segment
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## code::\linear:: || code::\lin:: || linear segment, the default
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## code::\exponential:: || code::\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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## code::\sine:: || code::\sin:: || sinusoidal S shaped segment.
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## code::\welch:: || code::\wel:: || sinusoidal segment shaped like the sides of a Welch window.
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## code::\squared:: || code::\sqr:: || squared segment
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## code::\cubed:: || code::\cub:: || cubed segment
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All values above will ignore strong::curvature:: input.
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note::
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When controlling this from the outside, use code::Env.shapeNumber(symbol):: to get the numeric value for each shape.
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::
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argument::start
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Initial value. If not specified, same as the input signal.
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argument::mul
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Output will be multiplied by this value.
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argument::add
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This value will be added to the output.
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Examples::
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code::
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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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code::
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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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