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  public static function centerMixLevelLookup($cmixlev) {
    static $centerMixLevelLookup;
    if (empty($centerMixLevelLookup)) {
      $centerMixLevelLookup = array(
        0 => pow(2, -3.0 / 6), // 0.707 (-3.0 dB)
        1 => pow(2, -4.5 / 6), // 0.595 (-4.5 dB)
        2 => pow(2, -6.0 / 6), // 0.500 (-6.0 dB)
        3 => 'reserved'
      );
    }
    return (isset($centerMixLevelLookup[$cmixlev]) ? $centerMixLevelLookup[$cmixlev] : false);
  }