What is "trigger" rate

Questions
3

Here are a few examples of code I’ve used recently that might help to illustrate what James explained above:

(
SynthDef(\jet, {
	var dry = LFClipNoise.ar(\noiseFreq.kr(48000).clip(0.01, SampleRate.ir));
	var wet = DelayN.ar(dry, 0.2, Env.perc(\freqAtk.kr(1), \freqDec.kr(3), 1).ar(0, \trig.tr(0)).exprange(\startFreq.kr(20), \endFreq.kr(20000)).reciprocal);
	var sig = XFade2.ar(dry, wet, \mix.kr(0.5));
	sig = Pan2.ar(sig, \pan.kr(0)).tanh;
	Out.ar(\out.kr(0), sig);
}).add;
)

x = Synth(\jet); //just comb filtered noise - trig is 0 by default here

x.set(\trig, 1) //whoosh

(
x.set(
		\trig, 1,
		\freqAtk, 0.001,
		\freqDec, 3.0.rand,
		\startFreq, 20,
		\endFreq, rrand(15000.0, 20000.0)
	);
) //run this as fast as you like for a new whoosh every time

Another example where a tr control is being used to rearticulate notes played by one synth without releasing the its envelope:

(
SynthDef(\303, {
	var sig = LFPulse.ar(\freq.kr(110, \glide.kr(0.1)), 0, 0.5).unipolar;
	var env = Env.asr(\atk.kr(0.01), 1, \rel.kr(0.01), -4).kr(\doneAction.kr(2), \gate.kr(1));
	var fEnv = Env.perc(\fAtk.kr(0.08), \fRel.kr(0.1), 1, \lin).kr(0, \trig.tr(1)).exprange(\cutoff.kr(200), \peak.kr(15000));
	sig = RLPF.ar(sig, fEnv, \rq.kr(0.5));
	Out.ar(\out.kr(0), sig!2);
}).add;
)

x = Synth(\303);

//legato sequence, no retrigger
(
x = Synth(\303, [\freq, 30.midicps]);
fork{
	5.do{
		[30, 37, 41, 40, 33, 48, 29, 31].do{|n|
			s.bind{x.set(\freq, n.midicps, \trig, 0)};
			0.2.wait;
		};
	};
};
)

//triggering the filter envelope
(
x = Synth(\303, [\freq, 30.midicps]);
fork{
	5.do{
		[30, 37, 41, 40, 33, 48, 29, 31].do{|n|
			s.bind{x.set(\freq, n.midicps, \trig, 1)};
			0.2.wait;
		};
	};
};
)
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