enable: "Filtering->Filter view" (by default this will cause the AviSynth/Vapoursynth preview to show a dual view preview which shows the original on the left and the filtered version on the right.
enable "Filtering->Synth auto referesh" which will automatically refresh the preview on any filtering change
No clue about capture cards, best state what you want to capture with it and post over at videohelp.com or look over at http://www.digitalfaq.com/forum.
Cu Selur
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Dev versions are in the 'experimental'-folder of my GoogleDrive, which is linked on the download page.
I'm an arch Linux user so I have quit a bit of experience getting this to work with VS on Arch. Pm me if you have any specific questions. I may put together a guide of some sort later though.
A few tips though. Try to avoid the AUR VS stuff with this. Leads to fuckery. Grab the latest version of the VS scripts from the hybrid GitHub. And I have a modified build script I use for the plugins and other tools. I'll link it later after work