If the Audio from the satellite reviever was originally Dolby Surround, Dolby ProLogic or ProLogic II matrix encoded, then the analogue outputs from the satellite box will still be matrix encoded to give you a surround output at the decoder.
Once a stereo file with Matrix surround has been encoded, the only way to break the matrix is to take that stereo file and "remaster" it, which will destroy the matrix. Even original CD's made from the same SQ encoded masters will decode to L/R/Ls/Rs or LRCS when played back through the correct decoder.
If you can get digital output from your satellite reciever, and the Audio is surround encoded, then again the output will decode correctly. Simple.
