This is very helpful, thank you. I didn't even think about rides. It'll be my first time at all the parks except MK so I'm not familiar with which rides and shows might have loud noises.
for me, I use my ear protectors on rides ( and I have a problem with more than just how loud something is.
EPCOT
FEA the sound is kind of loud thought out the ride ( he may not have a problem with this)
Soarin they have fireworks at the end that goes off
imagination train sounds ( I think the second room)
Some of the show in the pavilion is too loud for me.
HS
RnR coaster ( and yes you can wear them on the ride)
TOT there is a few lightning flashes that get to me.
I have not seen the stunt show in a long time but guessing this would be one.
AK
Dianasours bothers me but might not bother your brother.
all of dianoland ( it is like a carnival)
I know I used mine for the show at AK ( finding nemo, but I can not remember any sudden loud noises)
the pandora rides are fine ( unless I am having a really bad day)