MXR M81 Bass Preamp Bass PreampFor studio quality bass tones wherever you play, rely on the MXR M81 Bass preamp pedal. Separate input and output level controls let you take advantage of MXR's innovative Constant Headroom Technology for clarity at volumes other preamps just can't produce. The flawless direct out can be sent to the house pre or post the 3 band, sweepable midrange EQ section dial in tone for your amp and leave the PA to the sound chick. To get a new tone from an old