There's nothing unique about DVD-A discs. Any current DVD-ROM drive can read them, though without the proper soundcard and software player you won't get the high-fidelity audio track. All the audio travels over the PCI bus. It cannot go through the analog out on the DVD-ROM drive because the drive has no idea it's an audio disc and doesn't know how to decrypt the encryption on the disc. If you don't have the Audigy 2 with the proper software, you may still get audio, depending on the disc, but it will be a lower quality Dolby Digital track not the high fidelity DVD-A track. The only reason there is no digital out on soundcards for DVD-A is to prevent copying. You can get it on some HT equipment, either through propietary means or the new I-Link connection which is a firewire implementation that will be the standard for future digital audio transfers.