Hello Marten.
So, I tested it with a recording.
It's the same, no sound.
On the Sky HD Channels there is only one audio track, I think it's dolby.
The SD-Channels work fine, I looked up for a channel in SD with dolby track and changed to with the "g". Also no sound.
Do I miss something on my Windows-System to play back these channels/recordings with vomp-HD?
Markus