As DragonChild suggests, you ought to take a more component oriented approach, assembling the final product from base components.

I would probably have something along the lines of the following classes: CDPlayerInterface, RadioInterface, AudioDeviceInterface, CDPlayer, Radio, and RadioCDCombo. The Radio class would be a marriage of the RadioInterface and AudioDeviceInterface, the CDPlayer class would be a marriage of the CDPlayerInterface and the AudioDeviceInterface, and the RadioCDCombo class would be a marriage of CDPlayerInterface and RadioInterface and AudioDeviceInterface.

Or something like that... I'm not sure I like the specifics of my solution, but I think the general paradigm is better.

In reply to You need to break up the design more cleanly. by skyknight
in thread Understanding 'Multiple Inheritance' by punkish

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