I've read a Web page about the apparent inability of the Sony Digibox, with optical digital output, to carry the Dolby Digital 5.1 movies on Sky Digital. If the correspondence posted from Sony and Sky is correct, then it looks like Sony manufactured the '760 Digibox to Sky's specifications, and both parties were aware from the outset that the best sound format the optical connection could deal with would be Dolby Pro-Logic. It was never intended to carry Dolby Digital 5.1, as is the case with DVD players and Sky+ receivers. If this is true, then I'm both relieved and annoyed. Relieved because I resisted the temptation to replace my existing Digibox with the Sony model when I upgraded to Sky+, and annoyed because Sky have apparently imposed a block on third-party manufacturers making standard Digiboxes that can be connected to a Dolby Digital equipped amplifier. This is even worse for the many people who, with good intention, bought the Sony in anticipation of 5.1 channel TV. On top of this, it seems like Sony and the retailers who sell their product (including Sony Centres) were either unaware or unwilling to reveal the restriction. I can't really see why Sky would do such a thing except to contain a unique feature within the reach of Sky customers paying £300 for Sky+ and then £10 per month to make the full system work. Surely if 5.1 was available to more people, Sky would benefit by attracting a larger costomer following, a good portion of who would be more likely to consider Sky+ for the video recording capabilities. I'm not one who like to complain about Sky, as I do like their service, but I'm struggling to explain this one.