Jitter.GL mixing with Jitter Movie (using Syphon)

Hi – I've managed to pull in some open frameworks code into Max, and my goal is to eventually mix this feed with some movie clips using chromakey – but for now, to keep it simple, I'd like to just fade between a movie and my syphon / jit.gl content. I've managed to get a glitchy version of both a movie and the syphoned content playing in the same window, but have been unable to mix the two (I was attempting jit.xfade) – can anyone give me some pointers on how to get started? I've attached both the maxpatch and a screenshot to show what my current setup is (without the xfade). Thanks for any thoughts you can provide.

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