I am having trouble seting up my 687.I have a Fios DVR and a DVD player and a OTA hd tuner hooked up. I use the 687 to switch the OTA tuner and the DVD player which are hooked up on the component inputs and outputed via the moniter out to my plasma. I have 2 component video coming in and 3 audio coming in 2 opitical and on coax digital. I can switch between the video inputs fine but when I try to switch the audio it just defaults to my Fios DVR or my dvd player. I can't figure out how to get the sound from my OTA tuner which is hooked up digital coax. The manual is really hard to read any help?