Midway's Haunted House Gun Game Video
If you watched, relays are already there:
<>Disconnect common ground and normally open terminals on each sound trigger relay.
<>Then tie each directly to the guts of USB game controller buttons.
<>Then plug the game controller into any cheap/land fill computer or netbook.
<>Run a program that plays stereo/quadophonic sounds and even videos when game buttons are pushed.
This can be done because:
<>Common grounds on the switch terminals are not connected.
<>USB game controller chips have built in ESD resistors.
<>No electricity will pass to the game controller, just temporary shorts.
If you use computer motherboards, then additional things can be added to the game:
<>Display screen computer monitor can be added to the back panel of the game board.
<>Characters like Wizard of Oz witch video flying on a video screen planted in the back of the game when the witch is hit.
<>Attract mode can be added.
<>Different playfield colors can be added by changing the background color of the monitor in back.
<>With a few tricks, the gun can be connected to the USB port also, and add additional video game targets in the mounted screen.
<>Computer relay outputs can be created to add lazer/disco/explosion lights, and other effects.
This same process can be applied to any electromechanical game.