[oli@bass]

Ok, I found Effect Send (Reverb) as available assignment.

So there are three way to set this up:

1. Assign Soft Knob to Effect Send (Reverb)
2. Assign Modulation Matrix Slot 2 to Controller 12, Amount 1 to +63 and send to Reverb Send, assign Soft Knob to Controller 12
3. Assign Modulation Matrix Slot 2 to 10% Constant, Amount 1 to 0 and send to Reverb Send, assign Soft Knob to Assignment 2 Amount 1

In all these three scenarios the assigned Soft Knob works differently but correct:

1. Soft Knob shows the stored and current value in db and only adjusts if stored value is touched
2. Soft Knob shows the stored and current value (-64 .. +63) and only adjusts if stored value is touched
3. Soft Knob shows the current value and immediately starts adjusting, as if it was an external MIDI controller

Seems just fine to me.

BTW, I'm using a Darkstar TI2 with OS 5.1.3.0, and did the above on the hardware without VC.