I am having sky+ fitted tommorow, I believe you input a code to use an amp through it, I have a Yamaha htr-5540.
Also any other good features that sky+ has that I will find useful.
hope this helps - first time ive tried to link to a thread !.
I also posted how to do it about 2 mths ago so search for posts by me and you' might find it in PLasma thread.