S2 Sample Deck Volume w/FX
So, this is what I have here…
Left FX = Sample Deck C Volume 1-4
Right FX = Sample Deck D Volume 1-4
Shift+ Left FX knobs = FX3 Group Unit Amounts
Shift+ Right FX knobs = FX4 Single Param
Left FX1/2 = 3/4
Right FX1/2 = 3/4
Seems to work fine minus no LED feedback for turning on and off fx and their params 
But at least with this tweak you can stay within HID and have access to FX and Sample Deck Volumes.
Feedback welcomed. Improvements appreciated 