Dear Nicolas,
It doesn't and they don't have any desire to write open source or even commercial drivers for Linux. The Digigram Card (VX-Pocket) was the other solution for Mac and Windoze but the situation is pretty much the same. Apparently there is a going to be an ALSA driver for another PCMCIA card but please forgive me I don't have the information at hand.
_ Juan
I was just thinking: May be the Magma PCI extension chassis could work under Linux. It seems there is no need for special drivers, but I'm not sure. And it's quite expensive. BR Nicolas