I've been genuinely enjoying our new KISS Pro. I've made some modifications for my daughters because they are young, but love the game. I adjusted the game settings to add a ball save time after the Lock. It reminded me of the raptor pit on JP. If the ball goes SDTM, you get it back. I then took the instruments down to 4 to collect Ace. Makes the game more enjoyable and collecting the "blinking" members something to shoot for. I think I like the game more for it's nostalgia... It's a juke/pin, so the code doesn't need to be awesome.
Having said all that. Here's some easy fixes...
1) There are certain switches that do not make a sound during game play.
2) Obviously something can be done with the cities. Maybe not so many, if it makes choosing/collecting them too complicated.
3) Needs some meaningful shot or series to collect 2x and 3x, instead of random award.
4) Hopefully a different song during "KISS Army" multiball or "Rock City". If you can get to those wizard levels, it's a more than a little anti-climactic to hear a same song that could be chosen during regular game play.