I see two issues:
1) Either they have turned the music volume up, or the speakers have been slowly destroyed over the years - the current experience is ear splitting though. The music clips horrendously on some of the speakers, particularly the one in the far right corner and the one on the outer corner edge of the station. It's quite simply a poor sound system that worsens an already very heavily compressed score.
2) IIRC IMAScore delivered 90 minutes of music for The Smiler, yet the park continually use only a fraction of this for the area loop. There needs to be more of this used with a lot more dynamic range variety. As it is, you hear the same sections over and over and over - even when only queueing for a short while.
Echoing the thoughts of others though, I too will avoid The Smiler nowadays but in the case of a very small queue or the occasional single rider. It's simply a misery to stand in the pit and endure not only the obnoxiously loud music crackling through speakers on their last legs, but the noise of the actual ride itself.
