Question

I'd sure like 0/U on the Faderport to correspond to "0" on my Cubase faders. It's off by about 4 dB.

Answer 1

The way that the FP2 connects is thru the MCU protocol. this can cause issues in the way the DAW vs the Faderport displays Information.

there will be differences in that regard.

if you need further clarification you can reach out to Tech Support via the Support Ticket System.