I use the GK2a connected to my steinberger guitar. Then the GK2a goes into a Rolang GI-10 that changes the signal into midi informations. I then connect into the joystick port of my PC, and I can record and play the stuff I want into cubase VST... I also have a sound module (cna't recall the number though) that lets me play live without goinf through a PC.

There are great 'all in one' stuff now that allow yo to have the GK2a connected to a single device (be it a Roland VG88, or a Roland GR33) that have simplified the whole process of playing midi guitar... Have fun!!