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);