     beaconManager.delegate = self
     beaconManager.requestAlwaysAuthorization()
     
-    // 画面上のLEDの準備
+    // sound
     let count = Double(SLIT_COUNT)
     for i in 0..<SLIT_COUNT {
-      slitDegs += [360.0/count*Double(i)]
+      playerPoints += [360.0/count*Double(i)]
     }
     
     engine = AVAudioEngine()

    var rest: Array<Int> = [] // range外にあるslit
    
    for i in 0..<SLIT_COUNT {
      let slit = slitDegs[i]
      if _min <= slit && slit <= _max {
        result += [i]
      }

    // AudioPlayerの準備
    var format: AVAudioFormat = setAudioFile(tones.first!)
    for i in 0..<SLIT_COUNT {
      let player = AVAudioPlayerNode()
      player.volume = 9.0
      engine.attachNode(player)
