Longer than 5s audio fades

Is it possible to make an audio track (for instance, the background music imported from itunes) fade in or out very slowly, say over a period of 10 or 20 seconds? I find that a 5 second fade out is sometimes a bit abrupt.
On most other video editing suites I have used, I could manually adjust the audio levels on the timeline, usually by dragging the line down. This seems not to be possible in imovie 09. This is a major weakness, in my view.

set the first to manually fade from 100& to 80%, the next fro 80% to 60%, etc.
Not quite sure what you mean here AppleMan. The audio fade feature only allows adjustments in seconds, not by percentage, with a maximum fade of 5 seconds. You may be thinking of the Ducking feature which allows lowering of other tracks by percent, but this will apply the ducking to the whole portion - not progressively as in "fade out" or "fade in".
Or am I missing something here?
John

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