Peuclid | SuperCollider 3.13.1 Help

Description

Peuclid evenly distributes m hits in n beats. Many timeline rhythms coming from West African music that today be found in e.g. Cuban and Brazilian music are based on subdividing 12 or 16 beats into a number that is prime to them, such as 5 or 7.// a Peuclid with 3 hits within 8 beats: a = Peuclid(3, 8); a.asStream.nextN(9); // use Peuclid to control amplitude Pbind( \amp, Peuclid(5, 8, 4) * 0.2, \dur, 0.25 ).play;

Class Methods

.new

make a new Peuclid

Arguments:

numHits

with a given number of hits,

numBeats

distributed within a given number of beats,

repeats

and repeating a given number of times.

All arguments can be patterns.

Examples

(    // a percussive sound
SynthDef(\tic, { |out, freq = (60.midicps), amp = 0.1, pan, ringtime = 0.03|
    var env = XLine.ar(1, 0.001, ringtime, doneAction: 2);
    var snd = SinOsc.ar(freq);
    Out.ar(out, Pan2.ar(env * snd, pan, amp));
}).add
);

// use Peuclid to control amplitude via Pkey:
(
Pbind(
    \hit, Peuclid(7, 12, inf),
    \amp, Pkey(\hit) * 0.2,
    \instrument, \tic,
    // emphasize beat 1 with a lower pitch
    \freq, Pseq([[1000, 2000], 2000].clipExtend(12), inf),
    \dur, 0.125
).play
);

// play all euclidian subdivisions of length 12, from 1 - 12
// add ghost notes to hear grid
(
Pdef(\euclid, Pbind(
    \hit, Peuclid(Pseries(1, 1, 12).stutter(4), 12, 48),
    \amp, Pkey(\hit) * 0.2 + 0.02,
    \instrument, \tic, \ringtime, 0.1,
    \freq, Pseq([[1000, 2000], 2000].clipExtend(12), inf),
    // emphasize beat 1 with a lower pitch
    \dur, 0.125,
)).play
);

(
Pdef(\metro, Pbind(
    \instrument, \tic, \ringtime, 0.1,
    \freq, Pseq([[1000, 2000], 2000] * 0.5, inf),
    \dur, 0.75
)).play;

Pdefn(\numHits, 5);
Pdefn(\numBeats, 12);
// can also
Pdef(\euclid, Pbind(
    \hit, Pn(Peuclid(Pdefn(\numHits), 12, 48)),
    \amp, Pkey(\hit) * 0.2 + 0.02,
    \instrument, \tic, \ringtime, 0.1,
    \freq, 2000,
    \dur, 0.125,
)).play;
)

Pdefn(\numHits, 2pi);
Pdefn(\numHits, 4);

// an example of using the algorithm by hand
(
Tdef(\euclid).set(\numbeats, 12, \numhits, 7, \dt, 0.25);

Tdef(\euclid, { |ev|
    var currval = 0;
    loop {
        currval.postln;
        currval = (currval.round(10e-10) % ev[\numbeats]).postln;
        ev[\numbeats].do { |i|
            var isHit = (currval.round(1) == i);
            [currval, i, isHit].postln;
            if (isHit) {
                (instrument: \tic, freq: 2000).play;
                currval = currval
                + (ev[\numbeats] / ev[\numhits])
                % ev[\numbeats];
            };
            ev[\dt].wait;
        };
    }
}).play;
)

helpfile source: HelpSource/Classes/Peuclid.schelp
link::adclib/Classes/Peuclid::

PeuclidExtension

Description

Class Methods

.new

Arguments:

Examples

Peuclid
Extension