Quote:
The unit doesn't power off when I turn off the ignition and I expect this may be due to the peculiarities of the Audi wiring


Audi wiring is similar to VW wiring, right?
Why doesn't my player go into standby mode when I turn off the ignition?

Quote:
The radio signal strength meter is always greyed out along it's length. I seem to be getting reasonable reception

Sounds like the opposite problem of one of these, perhaps similar fixes are needed:
I'm having trouble with my tuner module!
My tuner gets terrible reception, but the extension cable is fine.
or possibly:
Some wires have pulled out of my docking connector!

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The left and right buttons don't work as the manual suggest they should when trying to tune the radio

Why won't the tuner scan for the next station?
Rio Car Button Guide.
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Tony Fabris