http://www.sonomawireworks.com/riffworksrequirements.php

The Line 6 Edition of Riffworks is obsolete. The currently available commercial versions work with Line 6 products. There is a free version (T4) and a Standard version available at a deep discount for Line 6 Editiohn owners.

http://www.sonomawireworks.com/T4

http://www.sonomawireworks.com/riffworks/

http://www.sonomawireworks.com/guide/index.php/Riffworks_Crossgrade

Hope this helps.