Ever vaporized into awe and envy as your favorite shredder picked up a guitar and  pulled a face-melting freestyle improv out of nowhere? How do they do that?

It’s one thing to do that with a full band backing you up. And with your solo neatly framed within the eight or 16 bars labeled “guitar solo” on the chart.

But what if you’re just you, out there, all alone? No band, no boundaries, no rules…