I am trying to configure my remote but I have read the 990 manual and still find it hard to know how "DVD input" relates to video N - where "N" equals numbers 1-13 (or so).

p.s. the remote is a harmont 1

I like to use the connection record chart in the manual on page 19. That helps me keep track of what's connected to what. The DVD connection is the easiest to start with as it is already labeled as far as the 990 goes. The Harmony remote I am not familiar with, is it a learning remote?

By default, there's "DVD" and then there are "Video1" through "Video4" (on the rear panel), plus "Video5" (on the front panel). As these are re-labeled on the 990, the front channel names of course change, but that order still applies. I don't know how the Harmony One's database is handling it, but I also tend to skip databases and manually learn commands (so I know where they are).

I usually include the number as part of the label, so the Digital Video Recorder will be labeled "DVR V3".

The Outlaw 990 entry in the Harmony One's database is quite good. If you select Devices->AV Receiver, you will see screen buttons for all the 990's inputs. They have the default names, but you can change these to match anything you've customized on the 990.

It would be a little unusual to use these on a regular basis with the Harmony One because switching inputs is usually associated with selecting a different "Activity". The only time I do this is when switching between analog and digital inputs from my DVD player. I was doing this often enough that I added 2 custom buttons to the "Listen to CD" activity so I wouldn't have to bounce out to the AV Receiver device menu.