On the one hand I don't know how anyone couldn't like Twilight Zone's default soundtrack. The jackpot theme is one of the greatest pieces of FM synth music every created IMHO, and that's just one of many fantastic tracks. On the other hand, as far as I'm aware TZ doesn't have any interactive audio stuff such as seamless transitions or synchronized lights or anything like that, so not much will be lost if you buy a Pinsound and use the original mix (My biggest pet peeve with Pinsound is that those sorts of effects are lost completely, so any game that uses them isn't a good fit for Pinsound).

Some other good examples are Addams Family, as you never get Thing flipping the flippers during the bonus jingle, Rollergames completely gives up doing the bonus countdown animation since that's supposed to be synced to the music, the music slowing down on Funhouse when Rudy falls asleep doesn't work quite right, seamless song endings on games like Diner, Creature, and Riverboat Gambler are lost, etc.

Actually I'm pretty sure the music does change as you progress down the river, but what's missing are the seamless transitions between those tracks as well as the intros each track has. The same applies for the Wet Willie's tracks and the really nice transition you get from the Wet Willie's theme to the first raft theme when finishing the mode.

Okay now that simply isn't true. The technology may not have always been top of the line but the amount of passion and detail put into the soundtracks and sound packages of classic Williams games was above and beyond what they needed to do considering that yes, most of the games ended up in noisy arcades. If you put on some headphones and listen to just about any soundtrack by one of Williams' sound designers I guarantee you'll hear details you've never noticed before.

What does PPS have to do with this? Williams' copyright is for the original recordings. I wouldn't think they would be able to claim ownership over new recordings even if the lines are the same. Unless you're referring to some other potential legal issue I'm not aware of.