For sale is an awesome and rare vintage Roland bass pre-amplifier. This is an excellent sounding pre-amp with a nice dual-optical compressor. Specifications: -Hi and lo gain inputs -Built-in compressor section with level, threshold, and dynamic range controls -Compressor is footswitchable (footswitch not included) -Tone creator section featuring: ~Bass knob with lo cut and hi/lo switches ~Middle knob with frequency switch ~Treble knob with hi/low and hi cut switches -Unbalanced volume and master volume knobs -Built-in effects loop -Balanced and unbalanced outputs