I read my manual and have to agree with stumped. The device has to support SR.
In additon I attempted to program my Pioneer Plasma remote to work with my RCA VCR. I found that I had to leave the door open on the cabinet to get the VCR to respond. This leads me to believe that the Plasma IR receiver does not pass the RCA VCR commands to my RCA VCR via the Pioneer Media box.
I wish it had ! It seems like it could since I got the wired Media box IR pointed at the RCA VCR. ANd I know already that the Pioneer will start recordings initated in the Media box but it will not pass the Remote control RCA signals thru the media box.
There is another output from the Media box that will control devices but it says in the owners manual that it will only work with Digital VCR devices.
I still like the Pioneer but there are a few things that Pioneer could have easily improved on like the lousy OTA digital TV guide.