I like where this is going. I've built a few Arduino projects to do heavy processing. I'm for sure not a programmer. I prefer the hardware side.

Keep posting and I will be reading.

With non-chime solid state games, couldn't you just skip the sound board and add a shield that has sound capability? I know there are a few and you could use MP3 files for the prerecorded sounds. It would give a whole new life to sounds because you could create a whole library. A small amplifier and your in business.

I have a spare -35 MPU that I'll be rebuilding. I would love to give this a try. I have a bunch of new Nanos ready to go.

By the way, I have my one kits out for science class with kids when we run out of other ideas.

I'm not a programmer, but was able to built a very accurate audio Watt meter with multiple modes & display choices. This is the prototype.

And now back to the topic...
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DickHamill - will do. Working on an EM pinball now. Once that is finished, I'm on to the spare MPU. I have a Bally Supersonic that I would use this in. Not really a test machine, but the only SS at my house at the moment. Supersonic is a 6 digit game.

If others come along, please work with them and we will link up later. Thanks!