Electro Harmonix Battalion Bass Pre-Amp And DIThe Battalion Bass Preamp and DI is a compact, flexible pedal that delivers powerful tone shaping capabilities in a rugged pedalboard friendly package. The Battalion is loaded with features that will appeal to tone conscious bass players and includes a four band equalizer, fully featured MOSFET distortion section with three signal path options, a compressor, a noise gate and comprehensive I O. Four band EQ tailored specifically for bass guitar.