The FX51 Juice Box is designed to add the right amount of distortion to a guitar when it is already running into a distorted amplifier. By slightly distorting the amp and kicking the FX51 on during solos or extra distorted songs, the FX51 adds more character and "Juice" without becoming too harsh. The FX51's harmonics stand out, and EQ lets you achieve many different tones that you could only get with two distortions. From tube like screams to rock-a-billy twang, it's all there.