jmy, that didn't exactly make sense. Re-read you last sentance.
I'd direct you to the exhuastive discussion here.
http://forum.ppcgeeks.com/showthread.php?t=49654
I'm not knowledgable enough with the internal circuitry to answer your question, but we have some of the brightest minds in the country working on it. You'll also want to check out the discussion here:
http://www.nuerom.com/BlogEngine/pos...-FM-Radio.aspx