Guitar Rig was my first guitar-to-computer interface and it was really impressive. This latest version still looks impressive, but ever since I switched over to the Line 6 HD300, which has the A/D converter built into a steel pedal board, I haven’t had much use for Guitar Rig. Here’s the article about the newest version. A lot of these features are already available in the Line 6 product. Basically, the Line 6 works more like something you’d have on stage. The Guitar Rig (by Native Instruments – a GREAT company from Germany)seems more like a studio tool.