From a past thread here:
Almost, but not quite... until now!Originally Posted by Oksi Moron
I've updated my TenCrazy.com MFX ControlCascade to allow for a "relative" mode, such that the modifying CC affects the Master CC up or down a given amount in relation to a detente value of 64.
So now you can draw in your Mod Wheel curve for the volume contour of a line, and then draw in secondary CC data of your choice to emulate the "tongue curve" or "breath curve" that wind instruments exhibit on a per-note basis.
You can download it here. (and free as always!)
And my apologies to those who do not have MFX-capable hosts!