Does anyone know what audio compression the terrestrial digital freeview uses in NZ?  I'm using GB-PVR and all is well except the Audio! I believe its aac but I have downloaded a million different things saying they have the aac codec in them with no sucess. I've heard people are using something called monogram?  does that mean anyting to anyone

I link to download the right thing would be extremely useful as I'm having zero luck finding it myself! 

cheers