Arduino Video Experimenter Shield plugged into an LZX Video Sync Generator. One doesn't like the other! Both are working well though, VSG takes other video input fine and VES looks great plugged into a v4. I know LZX is working on a Time Base Corrector module that should clear this up but it's interesting to me the VES doesn't sync properly even with video out from the LZX running into it. Going to try digital pin9 sync input next.