Following the other thread with the Flash Background sound issue, and thought I would start another. I am having the same problem (sounds work minus the background noise).
I have both 31 and 33 settings to "1".
What is the wiring connections on J3? Is wires connected to pins 2-5, 7? I have one that was not in place and was covered with heat shrink. I manually moved it to pin 6 and 7 and still getting no background sounds.
Board has new headers, sound rom, and caps on it.