EAST Profi BASS active el. , 3x dual potentiometr – 1x volume & balance,1x bass & treble ,1x middle amp + middle EQ , switch :active- pasíve, & pickups , 9-18v bat. – manual, / BLACK 1 set _____________ The J-RETRO 01 is designed to fit directly into standard “Jazz” style basses without modification, including a PP3 battery. Its high quality circuit uses three stacked knobs and includes an active blend circuit plus a 3 band equaliser with bass, variable frequency mid, treble and bright function. The active blend circuit prevents the loss associated with many passive basses where, when both pickups are up full, the signal fromone pickup feeds into the other and vice versa. However, a switch is included to allow a passive equal mix of both pickups. A second switch – basic “get-you-out-of-trouble” passive mode is included in case thebattery diesincrucial circumstances, but this modeallows use ablesettingstoo.