Check to see what type of audio output is selected. Example: if you select digital, then do not select optical and vice versa. That could be it. Give it a try.
Knowing me is like a riddle within a question wrapped in a mystery...unsolveable I own the following syatems: 1 PSX 1 PS2 1 Dreamcast 1 Turbografix 1 Game Boy Color 1 Game Boy Advance 1 Logitech Steering Wheel for GT3 45 Dreamcast games 152 PSX games 15 PS2 games 20 Game Boy Color games 35 Turbografix games
Looking forward for MGS2, Resident Evil 4 and Onimusha 2.