I am considering purchasing the new 20.0 or 21.0 to use with a DVR 510. The reason I am considering this is for my mother who has to use the remote for the home theater system. The current platinum remote for the 510 doesn't operate the muting or volume for the home theater system. Knowing that the remote is programmable, it will simplify things with only one remote. Is there any reason that either the 20 or 21 remote wouldn't work with the 510? The remote will be in the same room as the receiver.