Hi Jeanine,
If you are willing to regenerate the titles in Avid FX (which you should already have as it was bundled with MC 7) then you can use either the built-in lights or the BCC Light Sweep (in Avid FX) with full control over how the light sweep effect will interact with the title vs background video.
To apply the BCC 8 Light Sweep filter to a title with alpha and only affect the title and not the background video, you need to enable the “Apply to Title Matte” option in the BCC Light Sweep filter.
If you would like a step-by-step tutorial on any of this please let us know and we’ll whip that up for you.
I hope this helps!
Cheers,
Peter.