Tone.js/Tone/shim/AudioBuffer.js

import Tone from "../core/Tone";

/**
 *  AudioBuffer.copyTo/FromChannel polyfill
 *  @private
 */
if (Tone.supported){
	if (!AudioBuffer.prototype.copyToChannel){
		AudioBuffer.prototype.copyToChannel = function(src, chanNum, start){
			var channel = this.getChannelData(chanNum);
			start = start || 0;
			for (var i = 0; i < channel.length; i++){
				channel[i+start] = src[i];
			}
		};
		AudioBuffer.prototype.copyFromChannel = function(dest, chanNum, start){
			var channel = this.getChannelData(chanNum);
			start = start || 0;
			for (var i = 0; i < dest.length; i++){
				dest[i] = channel[i+start];
			}
		};
	}
}