102 lines
2.7 KiB
Text
102 lines
2.7 KiB
Text
class:: Psync
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summary:: synchronise and limit pattern duration
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related:: Classes/Pfindur
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categories:: Streams-Patterns-Events>Patterns>Repetition
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Description::
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Psync behaves somewhat like link::Classes/Pfindur:: -- it has a teletype::maxdur:: argument that limits the total duration of the event stream.
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The difference is in what happens if the event pattern stops on its own before teletype::maxdur:: is reached. If the total duration of the event pattern is shorter than the given maximum duration:
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list::
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## Pfindur simply ends: no further time manipulation.
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## Psync inserts a rest to round the total duration up to the nearest multiple of the given teletype::quant::.
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::
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table::
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## strong::Pbind's natural duration:: || code::Pfindur(16, Pbind(....)):: strong::behavior:: || code::Psync(Pbind(....), 4, 16):: strong::behavior::
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## 6 beats || Pfindur plays only 6 beats || Psync rounds up to 8 beats (adds a two-beat rest)
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## 18 beats || Pfindur cuts off after 16 beats || Psync cuts off after 16 beats
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::
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teletype::maxdur:: may be omitted. If the Pbind stops by itself, the rest will be inserted according to teletype::quant::, but the total duration will be unlimited.
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ClassMethods::
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method::new
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argument::pattern
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a pattern that returns events.
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argument::quant
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rounding factor for total duration (effectively a "bar length")
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argument::maxdur
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maximum duration
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argument::tolerance
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difference threshhold that a pattern must exceed max to be ended.
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Examples::
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code::
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(
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SynthDef(\help_sinegrain,
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{ arg out=0, freq=440, sustain=0.05, pan;
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var env;
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env = EnvGen.kr(Env.perc(0.01, sustain, 0.3), doneAction: Done.freeSelf);
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Out.ar(out, Pan2.ar(SinOsc.ar(freq, 0, env), pan))
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}).add;
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)
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(
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// a fixed duration pattern:
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f = Pbind(
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\dur, 0.5,
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\degree, Pn(4,1),
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\instrument, \help_sinegrain
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);
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// this pattern has indetermined length:
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a = Prand([
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Pbind(
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\dur, Pseq([0.02, 0.002, 0.1, 0.1],2),
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\degree, Pseq([9, 7, 5],inf),
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\instrument, \help_sinegrain
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),
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Pbind(
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\dur, Pseq([1, 0.35],2),
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\degree, Pseq([0, [2b,5b]],inf),
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\instrument, \help_sinegrain
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),
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Pbind(
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\dur, Pseq([0.15, 0.25, 1.3],2),
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\degree, Pseq([2b,4,5b],inf),
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\instrument, \help_sinegrain
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)
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]);
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)
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Pseq([f, f, a, a], inf).play; // play a sequence
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// Psync allows to limit the duration of a stream relative to a beat grid
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b = Psync(a, 1, 1); // create a sequence of exactly 1 beat elements
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Pseq([f, f, b, b], inf).play;
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b = Psync(a, 1, 2); // create a sequence of elements of either 1 or 2 beats length
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Pseq([f, f, b, b], inf).play;
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(
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b = Psync(a, 2); // create a sequence of elements with a minimum of 2 beats,
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// but with undetermined upper limit
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Ppar([
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Pseq([f, f, b, b], inf), // sequence
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Pbind(\instrument, \help_sinegrain, \freq, 1000, \sustain, 0.01, \dur, 2) // metronome
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]).play;
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)
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::
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