I bought a composite to HDMI capture device off of Amazin, and I am running tests on it with various consoles. Here it is playing Final Fantasy IV off of my SNES. This is just the intro. It faithfully reproduces sound and visuals (For the most part) but it is not perfect with this game or console. I am not sure if the problem is the SNES (It has been through a fire, so it might be) or the capture box, though. Still, it isn't so bad as to be unplayable.
Personal twitter: @fsmetal
Website twitter: @deliriumfeed
https://www.facebook.com/groups/352007142242/
https://plus.google.com/u/0/105800364840884102272
https://valereth2.tumblr.com/
https://www.twitch.tv/valereth