void ChangeVolume(bool up) {
    if (up) {
      STDOUT.println("Volume up");
      if (dynamic_mixer.get_volume() < VOLUME) {
        dynamic_mixer.set_volume(std::min<int>(VOLUME + VOLUME * 0.1,
          dynamic_mixer.get_volume() + VOLUME * 0.10));
        //beeper.Beep(0.5, 2000);                             // BC Custom Spoken Volume menu
        ::CommandParser::DoParse("play", "volchangeup.wav");  // BC Custom Spoken Volume menu
        STDOUT.print("Current Volume: ");
        STDOUT.println(dynamic_mixer.get_volume());
      }
      else {
        //beeper.Beep(0.5, 3000);                             // BC Custom Spoken Volume menu
      ::CommandParser::DoParse("play", "volmax.wav");         // BC Custom Spoken Volume menu
      }
    } else {
      STDOUT.println("Volume Down");
      if (dynamic_mixer.get_volume() > (0.10 * VOLUME)) {
        dynamic_mixer.set_volume(std::max<int>(VOLUME * 0.1,
          dynamic_mixer.get_volume() - VOLUME * 0.10));
        //beeper.Beep(0.5, 2000);                             // BC Custom Spoken Volume menu
        ::CommandParser::DoParse("play", "volchangedown.wav");// BC Custom Spoken Volume menu
        STDOUT.print("Current Volume: ");
        STDOUT.println(dynamic_mixer.get_volume());
      }
      else{
        //beeper.Beep(0.5, 1000);                             // BC Custom Spoken Volume menu
      ::CommandParser::DoParse("play", "volmin.wav");         // BC Custom Spoken Volume menu
      }
    }
  }