Xander - contact paul@mixvibes.com. He's based out of SF and is very responsive indeed. paul is moving to SF today actually he better send my soundcard
its more of a hak 320 considering you are un able to put in a eternal fader but on my xs 4 i had a ALPS in it and one of my friends has a pro x in but it requires modifications now i have a 56 though so i dont really play with xs 4 that much but their still great mixers