I think sozobe was right on about the drum noises being predictable and within his control, where other noises aren't. It probably isn't the loudness of the sound but how well he is able to process it on the spur of the moment.
I also think you hit on a very important point to do with the teaching styles Mo has encountered.
Quote:Mo's K teacher gave him the flexibility to move off to a quiet table when he was having problems and this helped him so much.
I mentioned it to his grade 1 teacher and she just moved him off by himself for the duration.
Having a quiet. predictable safe spot to move to to do work is very productive. Being sent away to work alone is punishment.
Ultimately it is a good thing for kids to be able to recognize the need to move into a space that is condusive to working. With some good teaching and modeling strategies, and an appropriate space set up for them, kids can learn to do this.
One teacher in my school set up an area called "the beach". Its a simple partition covered with ocean scene wallpaper. It has one desk, one chair a lamp ( florescent lighting can be harsh), and a cd played with a cd of quiet ocean sounds. The purpose of it is...a quiet place to work, or to go to to calm down and gather thoughts before poor behavior can escalate. Although it was designed a few years ago with a NVLD child in mind, it has been so successful for all students she has kept it going. Amazingly all of the kids take it very seriously and never abuse the privilege of using it.