Adding Cassette player

[plugot]

Does anyone know of any aftermarket cassette player that will work with the BMW Business CD radio? I want to add the ability to listen to cassettes. I know there are attachments for the ipod that takes the signal from the earphone output and sends it out as an FM signal. Anyone know if there is any equivalent for portable cassette players/
Any assistance or ideas appreciated.

[elbert]

What's a cassette? :D

A lot of these adapter solutions for iPods and XM receivers use a mini headphone plug which should work with a portable cassette player.