You know i couldnt find what bloody sound board either ROCK or ROCK ENCORE used.
But... on the sound board are some DIP switches.
You can try setting all to OFF and then back on again,
if i am right, then your DIP settings should be as follows:
DIP S1- used to do self test
DIP S2- Not used
DIP S3 and S4- Used for attract sounds and how often they are played. Both off is no attract sounds. Both on is maximum time between sounds.
DIP S5- background sound enabled during game play if on
DIP S6- Not used
DIP S7- Not used
