Can anyone on the QQ Forum offer any advice on a suitable decoder for the BBc Matrix H quad system. I have uncovered a number of tracks recorded by the BBC with various artists (Steve Gibbons Band, Colisseum II, The Stranglers to name three) and broadcast in 1977. Considering the age of the cassette and the budget tuner that I used they are of remarkably good quality. I am going to give Dolby Pro-Logic II and DTS Neo 6 a try, and also SQ. I suspect though that they will not be accurate in decoding. Would an Ambisonics decoder work? If so where on earth do you find them? Any advice will be very welcome.