Would somebody have some advice for a workaround (besides upgrading to the full version of Vegas) for the following, given the VMS four video track max.

I've use my top two layers of video for composting a mask, but only want that effect to apply to only a segment of the overall video. Outside of this effect, I need those two tracks for some PIP stuff in the rest of the project.

What is the best way to proceed - should I render the two composted tracks in avi, then reinsert it back into the timeline as a single track? If so, what would be the optimal settings so as not to loose too much quality after I reinsert then render this segment again as part of the larger project?

Or, is there any other way so as to make the composted segment not effect the whole project?

Thanks for any help.