This p.m I have plugged the digital out from my soundblaster live 5.1 to my Sony A.V amp 930.The sp/dif out seems to be working fine but I cannot get dolby digital only pro-logic ( through the digital cable). I am using power dvd.Is there any reason why a combo of soundbaster live 5.1 and power dvd would not output a dolby digital bitstream?? Help !! Thanks.