I've been searching the documentation but can't figure out how to do this one seemingly simple thing.

I'd like to be able to control two faders simultaneously with a MIDI foot controller (got this part figured out), but I'd like the second faders' values to reverse (to decrement- while the first fader increases it's values).

inverse-valuesfaders

thanks a ton...I spent a good hour/hour and a half at it last night...came close (the !- object), but I couldn't quite wrap my head around it.

!- and its multiplier cousin !/ can be very handy for certain things. addition and multiplication are commutative (order doesn't matter) but subtraction and division aren't, so that's why these objects exist. Sometimes they are just what you need---to create inverses or reciprocals.

Inverse Values/Faders