Thanks very much! I tried using 1 and 2, and still no joy. Apparently there is something wrong with my unit.

In the meantime, I used a splitter on one of the IR ports as a workaround.

I found this thread while I am programing the mx950 and was unable to assign a RFID higher than D. But the mx900 on the same system Worked like a charm assigning RF ID#14. Does the MX950 Not support the narrow bandwidth channels?

You have to set the MSC400 with a secondary RFID for ports 7 through 12 and then add that second ID to the remote. The remote will route the first 6 ports on the first ID and ports 7-12 on the second ID as 1-6

I have done that and then i went to RF control of the MX950 then to receivers and set the RF channel for emiters 7-12 and the drop down only goes up to ID #F no 11+ channels.

Go on the MSC400 editor and click on the configuration for the controller. Set the primary ID to one of the original IDs. Dont use one of the new ones. Then click the Secondary box and set that RF ID to one of the old ID's, but make sure it is different from the Primary ID. Then on your MX950 editor go to the Program menu and pick RF Set. Click the receivers tab and set up your Default receiver to match the first RFID. Then click add receiver and set that one to the secondary RF ID. Now, for devices connected to ports 1 through 6 on the MX950, route them to the Primary ID ports 1 through 6 and for the devices connected to ports 7 through 12, you route those to the secondary RF ID ports 1 through 6 (ie port 7 would be 1 and port 12 would be 6)

Hope that clears it up.