Quoted from YeOldPinPlayer:
meloyelo51 probably has them. I didn't see them in his store, send him a PM.
Thanks for mentioning me!
Found your thread from the PM...
To upgrade, you just need the CPU and Display roms and I'm cheaper
U210 F0FF CPU ROM v5.0
U5 B649 DISPLAY ROM U5 5.0A
Per your pics, your sound is all up to date by verifying checksums.
u7 a7ee v1.01
u17 9719 v1.0
u21 16ed v1.0
u36 adce v1.0
U37 e7e5 v1.0
Can't guarantee it will fix the sound issue, but sound roms normally would not be needed unless one of your chips is actually bad.
I would try the sound test and see if there are any errors displayed or heard.