There is a recently revitalized project to create an alsa linux driver for the Gadget Labs series of cards.
http://sourceforge.net/projects/wavepro-driver/
There is an active mailing list of the developers, testers, and interested parties who are helping located here:
wavepro-driver-developers@lists.sourceforge.net
It is recommended that if you are interested in reading the progress of this effort, that you subscribe soon because the mailing list will go 'private' around the middle of January (to keep out spam and other unwanted intrusions).
The end goal of this project is to have the driver included in the alsa distribution and eventually into the linux distributions so that owners of this card can simply have the card installed in their system and all the necessary steps will be done automatically by the installation, as is the case with SoundBlasters, onboard sound cards, Delta 1010s, RME 9652s, etc.
Having a working driver is several months away from now, and the developers who are helping write this are quite good, however, we are all inexperienced at creating drivers for linux and are unsure of the needed steps to get it included in the Alsa tree. We are also very receptive to any advice or help with the creation of this driver; feel free to sign up and be a part of this project. We have a major advantage because there is already a Windows driver available with source (including new FPGA firmware), which was developed after the Gadget Labs company went under.
Best wishes (and happy holidays!!)
Mike Mazarick