To use the 990 with a Harmony remote, try setting up the Harmony on-line setup process to work for a Sherwood/Newcastle R-965 (which currently is in the Harmony data base). That should get the correct naming and number of inputs right, etc. I don't know if the 990 IR remote codes are the same as the R-965 codes. If not, then you would have to "learn" the 990 remote codes for each of the corresponding entries in the Harmony data base for the R-965.