Get an AudioContext class that has "future compatible" names for methods.

AudioContextPatch.js

// Gets the AudioContext class when in a browser environment.
function getAudioContext() {
    try {
        var AC = (window.AudioContext || window.webkitAudioContext || window.mozAudioContext);

        function myAC() {
            var ac = new AC();

            // Future compatible names.
            ac.createGain = ac.createGainNode = (ac.createGain || ac.createGainNode);
            ac.createDelay = ac.createDelayNode = ac.createDelay || ac.createDelayNode;
            ac.createScriptProcessor = ac.createJavaScriptNode = (ac.createScriptProcessor || ac.createJavaScriptNode);

            var AudioParam = ac.createGain().gain.__proto__.__proto__;
            AudioParam.setTargetAtTime = AudioParam.setTargetValueAtTime = (AudioParam.setTargetAtTime || AudioParam.setTargetValueAtTime);

            var BufferSource = ac.createBufferSource().__proto__;
            BufferSource.start = BufferSource.noteOn = (BufferSource.start || BufferSource.noteOn);
            BufferSource.stop = BufferSource.noteOff = (BufferSource.stop || BufferSource.noteOff);

            var Oscillator = ac.createOscillator().__proto__;
            Oscillator.start = Oscillator.noteOn = (Oscillator.start || Oscillator.noteOn);
            Oscillator.stop = Oscillator.noteOff = (Oscillator.stop || Oscillator.noteOff);

            return ac;
        }

        return myAC;
    } catch (e) {
        return undefined;
    }
}