The 'interface connector' is (almost certainly) a serial control port, not a video output. LVD stored composite analog video, so there are no chroma or difference signals available to assist in digitizing the video.
Figured it out.
Hold Ctrl and yellow points will appear in the middle of connections.
Click on one where you would like to create the reroute.
You can now move it around and connect nodes to it.
This apparently works on "arrow connections" only, which makes sense.
You can also use the left toolbar (or throught a node - right click) and under "Other", ...
An XLR cable used with an adapter won't give you the audio quality that an all-XLR cable will. If audio quality is really important, I'd buy or borrow an external recorder that takes XLR cables directly. If this isn't an option, pick up an XLR to 1/8" adapter cable. I suggest taping the adapter to the camcorder so it doesn't move around much.
(Mic cables ...
Use XLR cables to get the audio from the PA to your camcorder. To convert the balanced PA signal to the line signal, take a passive DI-box (aka DI-unit). They are not expensive. You'll get a solid one for less than 50$ by Amazon.
DI-Units - Wikipedia
DI-Boxes - Amazon.com
I can't really say anything else beyond what Neil said...that's great info...but I'll throw this into the mix. If you're handy with electronics (or know someone who is), try making this adapter from off-the-shelf parts at Radio Shack.