24P or 24P Advance???

I can't find the letterbox filter on FCP 6. Is there was a place to set the aspect ratios too.
 
If you're mixing with 30p, or if you're mixing with 60i footage that you want to keep as 60i.

When the render is complete. How would a media player or a 'Video on Demand' system see the footage?
I'm sure that makes no sense but let me explain further. If I do a 60i time line or a 24p time line what frame rate does the media player or Video on Demand system see?

The reason I asked is because my distributors (VOD) have a limitation that says the slowest frame rate I should use is 29.xx ??
 
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