Mobs with custom sounds like the rainbow sheep and fancy chicken always seem to be at maximum volume with no attenuation for distance.

You can hear them anywhere they are in render range, even if you are above the clouds! The skeleton wolf I frequently hear when I can't even find it (underground somewhere?).

I think they are missing volume reduction for distance away?

Also some are also super enthusiastic, the fancy chicken frequently overclucking it's own sound :-)

it could be because the sounds need to be mono?
https://stackoverflow.com/questions/57277755/music-discs-have-do-not-get-quieter-by-distance-in-my-minecraft-1-14-4-mod