I am having problems trying to pair an old 21.0 remote with a Joey 3. In order to beable to pair this remote do I have to Unpair my original 54 remote? Basically can you have 2 different remotes paired to the same receiver? Is this the 21.0 remote in the UHF mode compatible with the Joey 3 or it is only IR compatible? If it is only IR compatible only then that may explain why I cannot pair it because I think my Joey is setup for RF only and since my original 54 remote is dead now then I cannot reconfigure the Joey to RF and IR.