I have the Invision Headrest dvd setup installed and I am wondering a few things.

1.) How to display video from one to the other (dual display of dvd that is playing for example).

2.) How to use volume on remote - seems like a silly question but seems like a function button needs pressed first but cannot figure that out. The wireless headsets work just fine and have their own volume control but for instance when using earbuds plugged direct to headrests this would be handy. Remotes work for everything else.

3.) I have a Pioneer AVH-P1400 HU. Possible to connect the headrest dvd units to this? I see no yellow video cable...seems like there should be something out there to make this possible.