if (strlen($parsedFrame['data']) > 0) {
                    $parsedFrame['incdec']['bass'] = (bool) substr($frame_incrdecrflags, 2, 1);
                    $parsedFrame['volumechange']['bass'] = getid3_lib::BigEndian2Int(substr($parsedFrame['data'], $frame_offset, $frame_bytesvolume));
                    if ($parsedFrame['incdec']['bass'] === false) {
                        $parsedFrame['volumechange']['bass'] *= -1;