5th anniversary edition R3 Distortion. So some of you rockers have been asking us to bring back the internal mid range control trimpot, but we thought a full size external knob is more welcomed. We also added an extra 3-step filter switch so you have more flexibility over high frequency range. The high setting gives you aggressive clipping for heavy riffs and the low setting makes the tone rounded and somewhat OD-like. The power jack is also top mounted as well.