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The loop function in Interpret Footage only works with external footage content, like Quicktime or AVI files.
Since you only need 5 repeats, I'd probably just make your loop manually by precomposing the original 2 layers, then pasting 5 copies and spreading them along the timeline.
For a more universal solution, you can use Time Remapping and expressions to loop a layer.
Precompose your existing comp so it is one precomp layer.
Trim the precomp to the required start & end point of the loop if necessary.
Activate Time remapping, which should automatically create a start and end keyframe
Extend the duration of the layer
Place this expression on the time remapping parameter:
You can also export your project as uncompressed, then re-import/interpret footage. You can also use the proxy funtion on your comp and it will do the same thing. I haven't done it before but I've read about it. Search the help file.
But anything using expressions has a much bigger cool factor!
Yes, I've long complained that AE needs basic looping features. Making new users resort to expressions is a pretty big requirement.
How about trimming your current comp's duration to the duration of the loop, dropping the precomp into a new comp 5 times the duration, duplicating your precomp four times, and then sequencing the layers? Easy as pie!
Can take less than 10 seconds with nifty key commands and right-mouse clicks!
Thanks to you all for your suggestions, I've had a lot of recent success discovering how to accomplish my desired result using your input. I also discovered a great site with some rather intense "how-to" videos for After Effects - granted they push their own product a little, but the lessons are free and extremely helpful, these folks are clearly experts. Check out http://ae.tutsplus.com/category/tutorials/ and also http://www.digitaljuice.com/dj_training/default.asp
Some seriously good stuff!
Hope these resources will help others - thanks again.