How do I split Left & Right audio tracks?

I recorded a presentation that only came out of one speaker (left)
On my timeline, I'd like to delete the a2 portion, and copy the a1 portion into that.... so it comes out of both sides.
I can't figure out how to delete one side without deleting both.
They stay highlighted together when I click on them
Thank you!!

Strange thing, Tom!
When I said Shift L would separate the 2 audio tracks, it did .............. on FCE 1.0.1, which I happened to have open.
But of course it doesn't on FCE 4.
Am I correct in noting this and has the functionality changed between FCE 1.0.1 and later versions ?

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25424...
Sure you do not want to give the Fill Left and Fill Right another try?
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Fill Left, Fill Right
The Fill Left effect duplicates the left channel information of the audio clip and places it in the right channel, discarding the original clip’s right channel information. The Fill Right effect duplicates the right channel information and places it in the left channel, discarding the existing left channel information. For example, you might use this effect on footage shot with a monaural microphone plugged into only one channel of a camcorder, extending the voice of a speaker from one channel to both.
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Is the speaker system OK?
We will be watching for your results.
Thanks for the follow up.
ATR

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I'm a newbie to the whole world of mac and this is my first time using imovie. What I am trying to do is to split the video track and keep the audio from it and run that over another video track, then come back to the original video track... so basically putting in a cut-away... is this possible with imovie?
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Hi - I was getting help from someone else on this aduio issue - and saw this post, so hope you don't mind my asking you too -
I extracted the sound out of a video clip. The track of sound got put doen below the clip, like it should. And it zerod out the original clip audio as it should.
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How do I split Left & Right audio tracks?

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