I have the same problem here. I do find the Variax Workbench but i can't install it on my Mac. I started to install and then it says can't install on this computer you need 10.5 or above. Hmmmm i use 10.11 so what can i do....
I also own a Line 6 Amplify 150 and i like it a lot. I also have a Line 6 X3 Live can i use it as a floorboard? I don't want to spent some money again for a Line 6 FBV Shortboard MkII.
And yes how must i connect it