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