     private class func pureBase(info: TuningInfo, centOffsets: [Float]) ->[SoundName: Float] {
         var tuning = [SoundName: Float]()
         let soundNames = self.arrangeSoundNamesForRootSound(info.rootSound)
-        // 平均律をベースに演算
+
+        // Calculatte based on equal-tuning
         let tuningEqualBase = self.equalBase(info.pitch, transpositionNote: info.transpositionNote)
         
         for i in 0..<soundNames.count {

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

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