Image Mask vs Modify Composite Travel Matte

I have about 30 different clips that I have recieved as RGB and Alpha separated QT movies. I can get the clips to pull the luma from the alpha movies with the Modify>Composite>Travel Matte technique, but that leaves me with a ton of files in the timeline. I would rather be able to use the Effect>Matte>Image Mask technique, but for some reason when I apply the alpha movies to the RGB movies the alpha that is created leaves the RGB transparent.
Does the Effect>Matte>Image Mask not work properly? Is that why the only technique I see in the forums discussed is the Modify>Composite>Travel Matte technique?
Thanks for any info.
2.0 Ghz G5 Mac OS X (10.4.7)

If you are able to set the mask image as the movie file, then you should try setting the mask type to luma, rather than alpha - since the alpha movies are probably black and white images which actually do not contain an alpha channel.

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Thanks James, that works.
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Despites wise advise of ¨just call me dude¨I obtain what I need, He oppens a new interrogative.
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Message was edited by: mrkeeney

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Image Mask vs Modify Composite Travel Matte

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