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not a "problem" for me but yeah i am noticing this...

on the shipped firmware it was low, the the next update made it louder (have threads on this here) and now its back to low.

i am judging this by the noise that happens when i plug up the pro at night. it was noticeably lower after this minor update but i was thinking perhaps it was in my head..

perhaps not...
 
Makes no difference to me as I find the iPad Pro's notifications somewhat annoying anyway. I always have my iPhone with me, and the iPad just duplicates all of those notifications anyway. So I hear a text message loud on my iPhone and then 5 seconds later the same text message hits my iPad.
 
You can separately control the volume of alerts in the Sounds section of Settings. Most people probably know this, but just in case some haven't this is a good thing to check.
 
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