Samuel,
As an interested party, I'm keeping my eye on your developments. Can you just confirm that you used the Mconfig program to add the Edge as a source, and as a matter of interest, what name did you give it?;
Adding the Source with MConfig
Add a Generic DVD Player (this will be your modified BD Player or Edge).
Choose OK (don't worry that it does not have the right connections)
Choose No (Advanced)
Choose Next (e.g. Leave it as Connect to G68ADV)
Choose New button next to the From:
Change Type to Multichannel Digital
Change the From Dropdown Box to Multichannel Digital
Optionally change the To dropdown to MD1, MD2 etc.
Choose Connect Button
Choose Finish
Cheers
Mike