I have a Sony DAV-DX255 Home Theatre and a Dish Network VIP622 DVR, I would like to use the DVR remote (5.3 IR Remote) to control my home theater system. I've tried the sony remote codes and the remote scan, but nothing works. I've been searching high and low to find a solution. I've read on this site that I must change the control function from AV2, sony's default, to AV1, but don't know if that is possible with this model of sony home theater. Any help is appreciated.