I never got round to having a go at the weekend, too busy at work!
What i'm planning on doing is:
Disassemble the unit, inspect the tape deck circuit board, where the audio signals come out of the tape deck, cut the trace on the circuit board, solder a connection after the cut and then test it.
That way, it wouldn't matter what tape was in the tape deck, it wouldn't be able to interfere with it.
My plan will probably change after i get it open and then start tracing the circuit!
Failing that, i'm looking at making a cheap adaptor that plugs into the cd changer socket, just getting my head round the M-Bus signals at the minute!
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