I have a Samsung Sky+HD box connected to a Yamaha RX-V361 amp. When the Sky sound setting is switched to the "Digital" option I get a distortion on the sound. The connection is via a Belkin optical lead. The sound quality is fine when a DVD is playing so I don't really suspect the speakers, which are Sony by the way.When the sound settings are reverted to normal the distortion disappears.I obviously prefer the Digital sound so am keen to resolve the problem. Any ideas?