om-telolet-om.js

var omTeloletOm = {
    lowBoundFreq: 300,  //initial frequency value
    upperBoundFreq: 800,
    freqState: this.lowBoundFreq,
    init: function() {
        context = new(window.AudioContext || window.webkitAudioContext)();
        oscilator = context.createOscillator();
        oscilator.type = 'sawtooth';
        oscilator.frequency.value = this.lowBoundFreq;
        gain = context.createGain();
        gain.gain.value = .7;
        oscilator.connect(gain); //connect the node
        oscilator.start(0);
    },
    start: function() {
        gain.connect(context.destination);
    },
    stop: function() {
        gain.disconnect(context.destination);
    },
    addFreq: function(frequency) {
        newFrequency = oscilator.frequency.value+frequency;
        oscilator.frequency.value = newFrequency;
        this.freqState = newFrequency;
        console.log('frequency state = '+ this.freqState);
    },
    subFreq: function(frequency) {
        newFrequency = oscilator.frequency.value-frequency;
        oscilator.frequency.value = newFrequency;
        this.freqState = newFrequency;
        console.log('frequency state = '+ this.freqState);
    }
};

function increase() {
    time = Math.floor(100+(Math.random()*50));
    setTimeout(function() {
        omTeloletOm.addFreq(100);
        if (omTeloletOm.freqState >= omTeloletOm.upperBoundFreq) {
            return decrease();
        }
        increase();
    }, time);
}

function decrease() {
    time = Math.floor(100+(Math.random()*50));
    setTimeout(function() {
        omTeloletOm.subFreq(100);
        if (omTeloletOm.freqState <= omTeloletOm.lowBoundFreq) {
            return increase();
        }
        decrease();
    }, time);
}

omTeloletOm.init();
omTeloletOm.start();
increase();