... the MB-11 distortion systemand new headphone Simulation, now the distortion sound is perfect.the MB-11 distortion system include the ... and passivedistortion tone,and there is a potentiometer to controlactive distortion tone .the new headphone Simulation include a switch and ... to play your guitar,don need any distortion pedal,and every easy to getperfect distortion sound, its the bigger convenience for ...