Like SC_detect_silence before, but with added second envelope to control the duration of the continued sound "tail"

SC_detect_silence_stretch

(
SynthDef("releaser", { | gate = 1 |
  var env;
	env = Env([0, 1, 0], [0.04, 6.0], releaseNode: 1);
	Out.ar(0, WhiteNoise.ar(1) * EnvGen.kr(env, gate, doneAction: 2))

}).add;
)


(
SynthDef("reverbreleaser_template", { | gate = 1 |
	var env, source, reverb;
	env = Env([0, 1, 0], [0.04, 6.0], releaseNode: 1);
	source = WhiteNoise.ar(1) * EnvGen.kr(env, gate, doneAction: 0);
	reverb = GrayNoise.ar(1) * DetectSilence.ar(source, 0.5);
	Out.ar(0, [source, reverb])

}).add;
)

(
SynthDef("reverbreleaser", { | gate = 1, gate2 = 1, stretch = 1 |
	var env, source, reverb, env2;
	env = Env([0, 1, 0], [0.04, 6.0], releaseNode: 1);
	source = SinOsc.ar(LFNoise2.kr(5).range(400, 4000))
	* EnvGen.kr(env, gate, doneAction: 0);
	reverb = Mix({
		AllpassC.ar(source, 0.3, 0.001.exprand(0.1) min: 0.3,  decaytime: 20);
	} ! 20
	)* DetectSilence.ar(source, 0.5);
	env2 = Env([0, 1, 0], [0.04, 1], releaseNode: 1);
	Out.ar(0, [source, reverb * EnvGen.kr(env2, gate2, timeScale: stretch, doneAction: 2)])

}).add;
)

a = Synth('reverbreleaser');

a.release(10);
a.release(3);

a.release(0.1);
a.set(\gate2, 0);
a.set(\stretch, 10, \gate2, 0);

a.release(10);


a = Synth('releaser');


a.set(\gate, 0);