Sound assignments
With any pinball machine, quite a few sounds(or voice callouts, or combinations of both) can be applied to various events. Here's just a list. Note that you are not limited to just one sound per event. To add variety to your pin, you could have even just different takes on the same callouts & randomly play one on invocation. For example, on a Sesame Street-themed pinball, you could have a callout of Bert saying "Get the extra ball!" as well as Ernie saying the same thing.
Scoring mechanisms
Standup target (each unique)
spinner target - make it brief
Orbit
Reverse orbit
ramp shot
failed ramp shot
inlane (each unique or shared)
outlane - negative sound
pop bumper - numerous sounds
kicker cup capture
kicker cup release
slingshot - unique left/right
ball launch - invoked when ball shooter lane switch is released. Example: Fun House
Other
credit add - partial - example "More please!" Star Trek: The Next Generation
credit add - complete
game start
mode begin
mode end
ball start
warning
tilt
extra ball lit
extra ball
shoot again
determine replay
replay achieved
high score achieved
"add x credits" - credit awarded(for high score achievement)