No it doesn't... (you DIDN'T know that, Donny? )

You can change the volume of the drum part for ONE registration, or ONE SMF, but change registrations (I do the 'one song - one registration' system) and it goes to the registration settings, requiring you to re-up the drums. Or call up another SMF and it reverts to the stored volumes.

I'm talking about a GLOBAL addition, regardless of whether you change UPG's or not...