It's normal to have the leftover pins, I believe.

The small connector actually goes to the speaker; you can where to plug it in at the bottom right of your first picture.

Use the left two ones on the connector on bottom right.

Without the game in front of me, I want to say EEE is correct.

If you still have sound issues, watch the LED on the board during boot. It's got a five flash boot sequence for diagnostics, similar to the MPU boot sequence. Nifty as hell.

I think someone on the forum had hi rez pics of the spots multiplier circle and rollover area. Do a research for all the embryon threads.

I was going to do high resolution scans of the various high-wear areas with my new restored embryon playfield but I never heard from anyone until after I started reassembly. HSA did an amazing job!

20141127_223359.jpg

I received this years ago when restoring mine. Can't remember from who.

embryon.jpg