We have telstra digital STB which I feed into the media centre via the s-video connection. The TV gets feed via the composite out on the STB (yuck!) However the sound volume is significantly lower via the 2200 then it is for the freeview channels which causes constant volume changes when swapping between freeview and Telstra channels.
I had a search but cannot find any way to change the line in volume in Windows 7. The STB volume is set to max. The volume is also a lot quieter different between the input from the STB to the AV and the input from STB - MC - AV.

