The reference manual says that the video inputs are set like: 1 Composite 2 Composite 3 Composite 4 Composite or 1 Svideo 1 2 Svideo...
Actually they do fine work and I do not compete with them. It is their business conduct that is in question and I am simply offering some insight...
Beware of Intelect Integrated Electronics. The company is run by liars and they will cheat you.