Marvel G200-TV leaks sound?

[Prefect47]

A problem I've had for some time with my Marvel G200-TV is that when both left and right are connected to the sound-in on the BOB (from a SCARC connector on the back of my TV) is that the sound "leaks" through the BOB, on to the sound card (ISA AWE32) and eventually ends up in my amplifier as an annoyingly loud yet recognisable distortion in one of my speakers. Is this a known problem or is my BOB or Marvel faulty?

(Note: Yes, I've checked, and Line Input is muted. If un-muted I get the TV sound loud and clear sound from both speakers)

[Kruzin]

This question would be best asked in the Desktop Video forum, where all the Marvel pros hang out....so this thread is now relocated there...