Maybe one generic volume for all your styles and sequences is good enough for you, Bill, but in my case, each and every song has an entire registration devoted to it, that calls up the entire state of the instrument with one screen tap.
Sounds, effects, splits, controller assignments, Part mutes, links to SMF's, links to lyrics displays, the total thing I need for each and every song (I don't believe in a bunch of button pushing while you are trying to play and entertain) are all stored in each UPG. And there is no way to add a GLOBAL offset to every UPG I call up just for one Part.
I know a lot of the old time arranger users still use the 'free panel' system, because that's what they got used to. But Roland's have always had the ability to store the entire setup per Registration, and that's what I'm comfortable with (and need, to be honest).
How does that Korg offset system work? Do you have to specify an absolute value for the drum track's volume (and how does it know which tracks are drum tracks in sequencer mode?), or can you say 'take all the drum tracks and add 15 to their value' (which is what I would need)?
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An arranger is just a tool. What matters is what you build with it..!