Ok i got it working using a third party tool called B-manager.
What i notice is that the logarithmic scales are dealed with improperly in the lower zones of the fader when the mixer is synchronised with the hardware, it gets stuck right above the small zone when around -47dB and then suddenly drops to the bottom as soon as it hits -Inf deb.
You might want to snoop around in the current Beta Duplex sourcecode (note that i linked directly to a post where Danoise supplies an answer to change a parameter to enable the midi feedback for the device) to get that right (Duplex does this correct).Btw, Duplex assumes factory Preset 1