NWZI,
I realize you posted this a while ago...
Would be able to walk through the troubleshooting solutions that worked for you. I stumbled on the Jazzmedia site several years ago but was never able to get the a6/2m to show up in the Sound Preference pane. My original 20 year old Mac was working fine as a dedicated go through but a leak during the winter rains took it out.
Good to know that it actually does work!