Two classic circuits, selectable via an internal slider switch:

Super Lead- The "Super Lead" mode gives you the great rock sound of a Marshall Super Lead amp with awesome harmonics, touch sensitivity, cab thumb, and kerrang. Higher gain than the Super Bass mode, Super Lead mode is perfect for use with humbucker-equipped guitars. It's gain range goes from classic plexi all the way to modified JCM800 levels. And, just like a great plexi, you can go from clean to scream with just a twist of your guitar's volume knob. Like a Super Lead, it's voice is all about thump and upper-midrange kerrang. This is THE rock sound!