// bidule holding a master track receiving from a bus, and a collection
// of Tracks
Mixer : Fadable {
	var name, master, masterBus, tracks, track, level;

	*new {
		|mixerName|
		^super.new.init(mixerName);
	}

	*initClass {
		StartUp.add {
			SynthDef(\master, {
				|in|
				var sig, releaser;
				sig = In.ar(in, 2) * \amp.kr(0.5);
				sig = Limiter.ar(sig);
				Out.ar(0, sig);
			}).add;
		}
	}

	init {
		|mixerName|
		name = mixerName;
		level = 1;
		masterBus = Bus.audio(Server.default, 2);
		track = Synth(\master, [in: masterBus.index, amp: level]);
		tracks = Dictionary();
	}

	addTrack {
		|trackName|
		tracks.put(trackName, Track(masterBus.index));
	}

	// access tracks like if Mixer was a dict
	at {
		|name|
		^tracks[name]
	}
}