I found this thread while trying to work out an issue with my DVR-108 player, and my Soundblaster Audigy 2 card.
Simply put, can't get 5.1 audio, or anything past 2 front speakers, playing via the DVD player. It appears to be using IDE audio, as I can remove the cable from DVD to SB card, and it still plays. I just noticed this today, have had the player for a long time, and not sure if it ever worked properly. The card definitely works fine, as I can do a speaker test and get audio from all channels.
The DVR has two audio outs...one 4 pin analog, one 2 pin they refer to as an SPDIF...I'm using the 4 pin cable, to the sound card "CD-IN"...
So...is this a windows setting I need to change, or??...when I go into control panel, and audio settings, I tell Windows it is a 5.1 speaker setup, and I would think that would allow of audio in all 5 speakers (realizing, it is not true 5.1), but nada.