Thanks. Ok I downloaded & reinstalled the correct USB driver! (Yamaha/Steinberg)
Now MOX shows up in AMS ok.
Getting a MIDI signal into Logic ok, but no Audio signal from the MOX, so nearly there.
So, so in Logic's audio driver preferences, which devices do you have set as the input audio device, and the output audio device? If you want to use the MOX as the input audio device, to feed it's audio into Logic, you'll need to choose it as the input audio device (I'm keeping things simple for now until we can verify everything is working ok).