I've been happy with my 921 (except for paying $949 one month before the price drop) driving my Samsung DLP thru DVI at 1080i 16x9. I just connected a bedroom SD set to the 921 RF output, and expected to be able to choose which set to watch by using the remote's HD/SD output switch. But when in HD mode, pressing the output switch doesn't do anything. Neither does pressing the output select switch on the 921 front panel. Holding the switch down for 3 seconds doesn't set it into safe mode either, it stays in HD. I can change modes by going thru the menu-setup-display, but I expected it to be easier to choose which TV to watch. Am I missing something? Thanks! TomH