problems with sound

For sound output on my mini, I have both Digital out and HDMI (or just internal speaker and HDMI if I pull the fibre optic cable). What I would like is to use HDMI whenever possible.

However, it appears to depend on the movie or TV show what actually gets used, so I'm reduced to changing the audio input on my AV receiver to find what's coming out this time: even the "Auto" setting on the receiver often gets it wrong.

How do I configure the mini/ Sapphire to always use HDMI?

Thanks and regards,
David

 No takers???

Regards,

David

There's some info regarding AC3 sound that may be helpful at the link below.

support.firecore.com/entries/304325-ac3-passthrough-5-1-surround-sound