Thanks. I appreciate the help. This is very enlightening. I guess I should have mentioned that my DVD player WAS a Denon 2900. Today, is is a TAW Digilink II, which WAS a Denon 2900. It has been modded to add the SDI output. I guess that the button you refer to was left out in the process. I need to figure out how to get it back. Hmmmmm.