The invention relates to a method for the determination of the object distance between an opto-electronic sensor working according to the principle of triangulation and an object,. The association between the two is through the use of a unique Trace ID. When the jog dial is rotated while being depressed with a predetermined pressing force, processing for providing sound effects is performed on the playback data to be played back from the optical disc in response to the amount of rotation detected by the detecting device.