Keith McMillen StringPort Guitar / Midi Interface for Mac
This is the most advanced guitar midi interface / effects suite you can buy for your GK equipped midi guitar. Super fast tracking, state of the art effects processing. You can read all about it here, http://www.keithmcmillen.com/stringport/overview
Super clean condition. Impossible to find on the "used market". Works and sounds perfect. Sells new for $995.00. Includes the Stringport, power adapter, and USB cable. You can download the latest software from the StringPort website.