I am jumping in only to say the same thing. I have the Phoenix R5.1MT amp and run from my PC to that amp and I used the Audigy as well. I had it for my laptop but got a new machine and no longer needed it. So, it went into the carpc. It is an awesome device and works great. The sound quality is just awesome. I have MII10000 with 512MB and a 100GB drive, running Audigy PCMCIA to the Phoenix amp and that runs out to an Xtant X603 powering a set of Dynaudio components, clarion center channel speaker, JL 12W6V2 sub and it is just great.
PS - Your Alpine PXA-H701 processor required an Alpine Control Unit/HU correct? Just wondering.
PSS - Never Mind I found it. You need one of the selected Alpine HU or the RUX-C701 Control Box.