Hello! We have a GYYR 16 ch multiplexer that has worked fine with several consumer VCR's. I bought a used RCA consumer DVR with DVD burner and while it records video fine ( picture looks great) I cant get the multiplexer to decode the DVR's video output into the individual cameras. Put a scope on the DVR output waveform and it seems that the signal and dc levels are quite different from what is going in. Also it does not seem to reproduce some of the timing signals produced by the multiplexer. Like I said the vcrs always worked fine and the DVR plays back a great picture if you just look at it in a monitor. Any ideas? Thanks much, Rob in Rochester, NY