Why do I have no audio in AE 6?

Hi. I recently began a project in AE 6 on a 2012 mac lion using a canon hf10 avchd. I exported the project from final cut 7 and imported the project into After Effects. The file imported, however upon opening, the audio played with no video and now as I attempt to edit in After Effects CS6, I am left with only video playback, no audio. I have a waveform and I have checked the audio box in the timeline and RAM preview.
One thing I noticed (and this may not be significant) is that in audio midi setup (MAC) there is a column that displays an After Effects 11.0 option. I clicked it and the window displayed to the right shows a USE/AUDIO DEVICE/IN/OUT/DRIFT grid. Within the USE column and Built-in Output row there is a box left unchecked. I checked it to activate the built in audio for the program, yet when I resume editing back in AE, the box unchecks itself. From this I suspect there might be a bug.
Has anyone here had the same problem? and if so could you please help me?
Eddie
P.S I've imported multiple different .mov clips in AE with different settings regarding their video quality (SD and HD) and none seem to contain audio playback when I play them as a composition and as a file themself. These files DO play their audio in Quicktime, however. Thanks, guys.

Hello,
I suppose you did want to post on the After Effects forum, but this is on of the Adobe Captivate forums...
Could you try there?
http://forums.adobe.com/community/aftereffects_general_discussion
Lilybiri

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