I'm not sure how long ago it was, but I noticed that in an update that was released several months ago (I think it was quite big), guests now don't scream as much on roller coasters, giving me the idea that they aren't as excited on roller coasters, even if the excitement, intensity, and nausea ratings are all REALLY good. Did Frontier explain this subtle change back then, or was there a problem with the audio of the screams, forcing Frontier to automatically lower the number of screams/cheers heard while riding roller coasters? I've noticed that some of the thrill rides still keep some of the excitement of people screaming, but even then I noticed many rides received the same lowering of screams heard on thrill rides, as well. Personally, I enjoyed hearing the many shrieks and happiness emanating from all my guests on each coaster I build and was hoping a future update would at least partially restore some of the excitement brought from the screams/shrieks when guests are on roller coasters and thrill rides!