Acrobat won't pass sound

[Mr. Strypes]

Just finished putting the Acrobat together. It lights up just fine. Testing with a multimeter, I'm getting voltage to all of the ICs. I assumed (and partially still think) there's a grounding issue, but I'm not sure. Of course, it gets power, so maybe not.
I've tried:
- Scraping all the paint away from the enclosure's 1/4" holes so there's bare aluminum touching the CLIFF washers.
- Attaching a ground wire between the CLIFF washers and then attaching that to an external ground.

Any ideas? Thanks in advance! (Love this community!)

 

[Nostradoomus]

Big ol solder bridge on the set of pins to right of the rotary.

 

[Mr. Strypes]

Oh, yeesh! Okay. I got rid of the solder bridge. It didn't solve the problem, but that certainly would have been an issue down the road. Thanks, Nostradoomus!