Do I have to be connected to the Internet to make the Fretlight guitar work?
From Fretlight Knowledgebase
Absolutely not. All you need to do is to connect your Fretlight Guitar to your PC or Mac via the USB port, launch on of our award winning software and away you go. The only reason that you'll want an internet connection is to download additional software like M-player songs, Lesson Paks, Style Paks, etc.