I'm having trouble getting 5.1 audio out of my system. I have an optical cable from the PS2 to my receiver. I went into the set up menu in the receiver and assigned VCR2/AUX for the PS2. But when I hit the AUX button on the remote I get nothing. The instructions in the PS2 and the receiver aren't helpful. Any ideas? I'm using PS2- 5CPH-50001/97011 Sony TV- KV-36HS20 Denon receiver- AVR3200 Thanks in advance!