The HY256-TL is a digital I/O card for HY card slots, and compatible with Yamaha’s TWINLANe* audio network protocol.To take full advantage of the superior features and performance offered by your HY256-TL, and to enjoy years of trouble-free use, please read this owner’s manual carefully before using your card. After you have read the manual, keep it in a safe place.* TWINLANe can transmit audio signals over a maximum of 400 channels and control signals via a single cable. Refer to the RIVAGE PM10 Operation Manual for details