DiodeNode = function(context_) {
		this.context = context_;
		this.node = this.context.createWaveShaper();
		this.vb = 0.2;
		this.vl = 0.4;
		this.h = 1;
		this.setCurve();
	}
`vIn` is the modulation oscillator input 
`vc` is the audio input.