On board audio is great. It can really add to a ride! Rokit is different as you get to pick a song that isn't edited for the ride and just cuts out at the end. Timed audio that works with the ride is great!
This magical themed Mack Spinner has an amazing soundtrack created by IMAscore and it works so well with the ride! Vogel Rok at Efteling has a great score that makes you feel part of the adventure. If done properly, on board audio could be great for Hulk! Lighting wise if we're to get it, I'd love just a simple pulsating green strip down the train to be like radiation. Nothing fancy like Rokit as that would just be like tack on Hulk.