As I've said many times in the past, one of the big things was unfortunately omitted from sound value decoders was CV 113, the one that keeps the engine quiet when first powered up until moved, then shuts the sound off after a time interval selected by the user. The blower and air pump just keep whirring all the time when you first turn it on, very annoying when all your other engines are still quiet.
It occurred to me that you could solve this aggravation by turning down the volumes of the blower and the air pump. It worked. CV 132 is the air pump volume. CV 134 is the blower volume. I turned both down to a value of five. You can barely hear them, but you know they're there and they're not overpowering everything else around it.
Try it out and report back.