Hi!Your BC 9500 has a special line-in-out socket, wich is covered with a shortcircuit-cap (when not used), Only pull that off and plug in a DIN-RCA-adapter and you have the in's and out's ! (DIN pin 1 is out right, 4 is out left, 3 is in right and 5 in left). Cheers Chris Btw: this signal is volume contolled!