Free when triggered frees a node
superclass: UGen
*kr(trig, nodeID)
trig when triggered, frees node
nodeID node to be freed
//example
s.boot;
SynthDef("a", { Out.ar(0, SinOsc.ar(800, 0, 0.2)) }).send(s);
SynthDef("b", { arg t_t=0; Out.ar(1, PinkNoise.ar(0.3)); Free.kr(t_t, 1001); }).send(s);
s.sendMsg(\s_new, \a, 1001, 0, 0);
s.sendMsg(\s_new, \b, 1002, 0, 0);
s.sendMsg(\n_set, 1002, \t_t, 1);
s.sendMsg(\s_new, \a, 1001, 0, 0);
s.sendMsg(\n_set, 1002, \t_t, 1);
s.sendMsg(\s_new, \a, 1001, 0, 0);
s.sendMsg(\n_set, 1002, \t_t, 1);