Pconst constrain the sum of a value pattern 

superclass: FilterPattern

Pconst(sum, pattern, tolerance)

embeds elements of the pattern into the stream until the sum comes close enough to sum.

similar to Pfindur, but works with the value directly.

(

var a, b;

a = Pconst(5, Prand([1, 2, 0.5, 0.1], inf));

x = a.asStream;

9.do({ x.next(Event.default).postln; });

)

Pconst used as a sequence of pitches

(

SynthDef("help-sinegrain", 

{ arg out=0, freq=440, sustain=0.05;

var env;

env = EnvGen.kr(Env.perc(0.01, sustain, 0.2), doneAction:2);

Out.ar(out, SinOsc.ar(freq, 0, env))

}).store;

)

(

Pn(

Pbind(

\dur, Pconst(1, Prand([1, 0.02, 0.2], inf)), 

\instrument, \help_sinegrain, 

\degree, Pseries(0, 1, inf),

\octave, 6

)

).play;

)