http://line6.com/support/page/kb/_/pod/pod-hd500-hd500x/pod-hd500x-compatibility-with-workbench-175-an-r565
Seems the software "workbench" don't work with pod hd500x and variax 300/500/700. Fu**ing kidding me? I paid for a pod hd500x and a variax 300, and i have to pay more for a workbench interface??! Seriously?