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A few connections that were used for non-pinball games and some small logic linked to those that exist and were rarely used.
Biggest changes were the channel mixing resistors - R23 and R24.
An option to bypass the CPU-controlled volume control and allow wiring of a volume pot mounted beside the coin door.
Quoted from Pablito350:I have an Addams Family sound board in my Funhouse. Rudy's speech was much lower than I thought it should be. Turns out that R23 and R24 were not the correct values for the game. After soldering in new resistors of the correct value the problem was solved.
Great call out of those resistor values Coyote!
-Paul
Yup, I realized it when I swapped sound boards in my TZ - couldn't figure out why it sounded horrid, until I noticed the differences. They were changed mid-WPC run, give or take. 
Quoted from DumbAss:The PinWiki documents this.
https://www.pinwiki.com/wiki/index.php?title=Williams_WPC#Unbalanced_Sound
The manuals also document this although it is not readily apparent without comparison.
[quoted image][quoted image]
This!
And note that the two different values given are NOT what is in the WPC Schematics document. So go by the game's manual.
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