preEQ

gistfile1.js

        this.gainNode = this.ac.createGainNode();

        this.lowEQ = this.ac.createBiquadFilter();
        this.midEQ = this.ac.createBiquadFilter();
        this.highEQ = this.ac.createBiquadFilter();

        this.lowEQ.type = 3;
        this.midEQ.type = 5;
        this.highEQ.type = 4;

        this.source.connect(this.gainNode);
        this.gainNode.connect(this.lowEQ);
        this.lowEQ.connect(this.midEQ);
        this.midEQ.connect(this.highEQ);
        this.highEQ.connect(this.ac.destination);