Read the 'dumb question' thread with interest, and have been trying to apply it to get the natural-seeming combination of CC#7 as overall volume level with CC#11 changing the volume between 0 and the max overall volume level as set by CC#7.
From the left panel of k2, the 'auto' section, trying to drag the CC#11 over to the main volume slider in the instrument header results in a conflict, I think, where both cc#7 and CC#11 adjust the volume without regard for each other. Last controller of either sort sets the volume level.
From the left panel of K2, the 'auto' section, dragging the CC#11 over to the volume knob in the Amplifier section (seen when instrument edit, the wrench, is selected) works. This controls the volume for ONE OR MORE groups within the instrument; with Edit all Groups selected, it controls the volume for all groups within the overall volume level set by CC# in the instrument header. This works, but not sure it gives the right sounding expression to me, when used in combination with a drawn-in CC#11 curve in my sequencer. Using an instrument that started out with 0.0 in the group edit volume knob, the CC#11 0-127 changes that knob value from -infinity to +12db, and CC#11=80 sets it back to 0.
Without using the left panel of K2, but still in the Amplifier section, one can select 'add modulator', choose 'external sources' and 'midi cc', then set controller #11. Leaving the initial value as 0, and setting the slider fully right, gives an expression curve that's audible, but nothing visible changes.
Which way is better? And, let's say I ALWAYS want CC#11 to work the same way for all instruments --- how to set that up? Do I have to edit and save every instrument? Or each new multi has to get this configured?