How to edit audio without disturbing video

Hi:
I have working with FCP 6 on another office Mac and got 7 for my iMac. On the other machine, I could edit audio (cutting, trimming, deleting, etc) without disturbing the video clip tied to it. However, now I cannot. If I highlight the audio track, I also highlight the video track. Any cutting or trimming I doto audio results in a trim or cut of the video.
How do I make it a default that these two tracks should be treated separately?
Any help would be really great.
Thanks.

This looks like it will work. However, is there anything in settings to, by default, only select the one audio or video track that I want to edit rather than selecting the audio or video tied to it too?
Thanks

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