message: using Math.log2 instead of dividing by Math.LN2
diff: @@ -131,7 +131,7 @@ define(["Tone/core/Tone", "Tone/type/TimeBase"], function (Tone) {
  */
  Tone.Frequency.prototype.toNote = function(){
  var freq = this.toFrequency();
  - var log = Math.log(freq / Tone.Frequency.A4) / Math.LN2;
  + var log = Math.log2(freq / Tone.Frequency.A4);
  var noteNumber = Math.round(12 * log) + 57;
  var octave = Math.floor(noteNumber/12);
  if(octave < 0){
  @@ -279,7 +279,7 @@ define(["Tone/core/Tone", "Tone/type/TimeBase"], function (Tone) {
  * Tone.Frequency.ftom(440); // returns 69
  */
  Tone.Frequency.ftom = function(frequency){
  - return 69 + Math.round(12 * Math.log(frequency / Tone.Frequency.A4) / Math.LN2);
  + return 69 + Math.round(12 * Math.log2(frequency / Tone.Frequency.A4));
  };
  return Tone.Frequency;
  