Can anyone advise/help me with setting up an Azbox premium box to allow it to be sent around the house to my other tv.

Currently i have a 8 way booster box in the attic that supplies my digital tv aerial to all the rooms.
Downstairs in the main room where the azbox is there is a wall plate with a "return aerial" port on it which means i can take the aerial lead from the RF out port on the azbox and put into it, this then sends the signal back up into the attic and into the booster box.

Problem is i can get a picture but cannot get sound coming through from the RF port on the azbox.

Also id like to be able to use something like a magic i to allow channel changing from upstairs.

Would getting a scart to RF modulator help ?