             baseTuning[i] *= 2.0
         }
         
-        // Go up til Gb and go down after G
+        // Go up till Gb and go down after G
         let indexBoundary = 6  // index of Gb
         let indexOfTranspositionNote = sounds.indexOf(transpositionNote)
         if (indexBoundary < indexOfTranspositionNote) {

    // => http://ja.wikipedia.org/wiki/%E9%9F%B3%E5%90%8D%E3%83%BB%E9%9A%8E%E5%90%8D%E8%A1%A8%E8%A8%98
    private class func equalBase(pitch: Float, transpositionNote: SoundName) -> [SoundName: Float] {
        
        // Frequencies if transpositionNote = C
        var baseTuning: [Float] = [
            self.frequencyForPitch(pitch, order: 3.0)  / 16.0,  // C
            self.frequencyForPitch(pitch, order: 4.0)  / 16.0,  // Db

        return tuningForCurrentOctave
    }
    
    // Tuning Equal
    private class func transposeTuningBase(tuningBase: [SoundName: Float], transpositionNote: TranspositionNote) -> [SoundName: Float] {
        return tuningBase
    }
