I don't seem to be allowed to post in the other forum for Digi so am posting here.
I have soldered on my Digi and have tried with Raspbmc, Volumio and the test image. From either the coaxial or optical I get no sound at all, however my pre amp registers a 48k PCM signal incoming so there is some kind of handshake between the digi and the pre-amp happening.
When I switch back to HDMI from the Pi and a HDMI SD/DIF optical splitter the pre-amp plays the sound from the Pi just fine.
What can I do to resolve this?