An information layer for an optical information storage medium is formed in a centrifuge. The pedal resistance determination module determines a desired accelerator pedal resistance based on at least one of engine and transmission operating conditions. As the blocking flap reaches the balance point the actuator is released which allows the blocking flaps momentum to carry it through the balance point where gravity takes over to finish the travel. One or more audio speakers are driven by the playback unit and is secured nearby to the reclined or seating location of the young child. In order to achieve more effective memory management, it is proposed that a switching device be provided to selectively connect the memory connection to the first bus and to one or more additional buses to effect a memory access in order to transmit data, addresses, andor control information from or to these buses. Linear light source elements are particularly useful to treat elongate portions of tissue in a vessel.