I am a technical guy.
I enjoy a good pinball machine, and have since childhood. I worked in that industry for a long time too. Many of us owned our own pinball machines, and that included my pal Stuart. He had a great Gottlieb Funland pinball. We used to gather in his basement to play it for hours. Like most Gottliebs, it is a shooters game. Contrast to Williams games which are more about fast action. Or Bally games which tend to have a more basic, dumber "game" to them.
Meanwhile, Williams also made a lot of baseball pinball games. These are games where the playfield looks like a baseball diamond, a ball pitches out from under a flap on the field, and you have a baseball bat you control with a button. Those have been around a long time. Some later ones had an electronic sound unit added. By today standards it was pretty crude, but in the 1960-70 era, it was cool. It made a low level crowd noise background - mainly just white noise. But for when you got hits, the crowd got loud. There were also explosion sounds for home runs. Both pows and big booms.
One time I conspired with Stu's girlfriend to go over to his house during the day while he was away. And I installed one of these sound units into his Funland. The FUnland, like all pinballs of its era had three chimes inside, so it went bing, bong, or boong, as you scored. I added this electronic sound unit, mounted a speaker inside, and wired it into the relays. In some cases I had to add extra contact blades to the relays for my new functions. SO be it.
Now when you fire up the Funland, nothing different at first. But after a bit, certain targets made explosion sounds. Stu looked concerned first time noises started coming out. Then once you advance the game far enough, the SPECIALS light up. And that turned on the crowd noise. Stu now knew something was up and was enjoying the trip. There are a couple spinning targets on Funland, and hit them and the game cheers loudly and when you actually win a game, the loud boom happens.
It wasn't really challenging technically, but it was fun and a great surprise for Stu. Nowdays, pinballs have electronic symphony orchestras inside. But I like to think mine was a pioneering project.
https://pinside.com/pinball/archive/fun-land
https://www.bleedingcool.com/2017/11/05 ... ball-1957/