///////////////////////////////////////////////////////////////////////////////
//
//  DRY/WET KNOB
//
// 	equal power fading
//	control values:
// 	   	0 = 100% dry
//		1 = 100% wet
///////////////////////////////////////////////////////////////////////////////

define(["Tone/core/Tone", "Tone/signal/Signal", "Tone/signal/Scale"], function(Tone){

	Tone.DryWet = function(initialDry){
		Tone.call(this);

		//components
		this.dry = this.context.createGain();
		this.wet = this.context.createGain();
		//control signal
		this.control = new Tone.Signal();
		this.invert = new Tone.Scale(1, 0);
		this.normal = new Tone.Scale(0, 1);

		//connections
		this.dry.connect(this.output);
		this.wet.connect(this.output);
		//wet control
		this.chain(this.control, this.invert, this.wet.gain);
		//dry control
		this.chain(this.control, this.normal, this.dry.gain);

		//setup
		this.dry.gain.value = 0;
		this.wet.gain.value = 0;
		this.setDry(0);
	}

	Tone.extend(Tone.DryWet);

	// @param {number} val
	// @param {Tone.Time} rampTime
	Tone.DryWet.prototype.setDry = function(val, rampTime){
		rampTime = this.defaultArg(rampTime, 0);
		this.control.linearRampToValueAtTime(val*2 - 1, this.toSeconds(rampTime));
	}

	Tone.DryWet.prototype.setWet = function(val, rampTime){
		this.setDry(1-val, rampTime);
	}

	return Tone.DryWet;
});