Weisbaden with Sony/Blau/Audi CD changer question

[Huw Powell]

OK, so my new 88 90Q now has a functioning radio/cassette, thanks to 
that Audi parts superstore place.

I have a few cartridges for the Sony-branded CD changer (CDX-A30) in the 
trunk, which I suspect "communicates" with the radio on an FM frequency.

Does anyone know what frequencies I should try?  And, indeed, if this is 
how it works?  This car is stuffed with aftermarket electronics (wiring 
and antennae for 3 radios, Chilton alarm, etc...), I'm assuming and 
hoping that most of it still works.

Thanks in advance for any suggestions!

-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/