// title: Simple Amplitude Tracker (language side)
// author: rukano
// description:
// It's jsut an amplitude tracker, to exaplin how to send values from scsynth to sclang.
// code:
(
// Simple amplitude tracker sending values to sclang
SynthDef(\ampTracker, { |in|
	var freq = 30; // num of values per second
	SendReply.kr(Impulse.kr(freq), '/amp', Amplitude.kr(SoundIn.ar(in)));
}).add;
)

// start the tracker on scsynth
Synth(\ampTracker);

(
// receive the values in sclang
OSCdef(\ampTracker, { |m|
	m.postln;
	// now use m[3] for your purpose (detecting changes, etc...)
}, '/amp');
)