[. . . ] Hughes & Kettner Metal Shredder / Metal Master The controls, switches, jacks etc. [. . . ] The MID control takes its place in the signal chain before the tube stages and its main purpose is to adapt to the characteristics of the guitar and pickups. For the sake of avoiding undesirable distortion in the bass or treble range, the BASS and TREBLE controls are positioned in the signal chain after the tube stages. The Metal Shredder/Metal Master has a separate headphone jack (PHONES). This jack is turned ON or OFF with the back panel switch marked Phones. At the same time that it switches the headphone jack on, it also applies CABINET SIMULATOR circuitry (like in the Hughes & Kettner Red Box) to the signal appearing at the SPEAKER OUT jack. speakers connected to this jack the sound character of a guitar loudspeaker. [. . . ] In contrast to the Cream Machine and Blues Master/Crunch Master, the internal switches, which set how Bypass works, are as follows: [. . . ]