I mucked around with wiring yesterday, connected the speaker to the orange and blue wire on the connector where the loom is missing but no sound yet.
there is another socket just beside that one that has 2 wires in it, tried that but still no good, will keep investigating further but if i cant get it going, i wont be too worried.
The two pin should be for the "Win Meter". Like for when every time a prize falls through the hole it counts, kinda like a coin meter but for prizes won.
Have you let it just sit there and run a while? (the tune is a timed interval)
Or played it a time or two to see if it made any noises?
I really still can't say for certain if yours has the tune option on the ROM.
Might try flipping dipswitches 4, 5, 7 back and forth a time or two just for kicks.
Oh...with machine off, flip dipswitch #8 ON, turn machine on...should go into self-test mode.
Then turn ONLY dipswitch #4 ON, this is the sound test (if you have the sound option of course).
Love your other projects, the contemporary look is a nice touch.
I've wanted to do some barrel projects myself, but more traditional Pong and Donkey Kong an such for those.