Is it possible to create a supercontrol that controls multiple controls but adds / subtracts from their current values?

Question

MIDI Target Manufacturer(s): Other/Unlisted Maker

New user struggling with super / sub controls.  I am confusing to control a Ketron arranger.  I have sliders configured to control volume of Bass, Drums, etc..  I want to create an additional slider that controls all of these individual sliders. I have successfully done this but it sets them all to the same values,  I want the super control to move all the other individual controls equally bu from their current value.  Basically for this example, I want it to be a master volume but leave the mix as it is.  Is this possible?

Thanks

Answer 1

Recently answered

Still on the first page of Q&A: https://mididesigner.com/qa/9070/maintain-different-lowering-simultaneously-supercontrol

Answer 2

Recently answered

Still on the first page of Q&A: https://mididesigner.com/qa/9070/maintain-different-lowering-simultaneously-supercontrol