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Dunlop positioned the MXR Bass Octave Deluxe (M288-U) as a dedicated bass sub-octave effects pedal, built around two independent analog sub-octave voices running in parallel alongside a Dry control for the clean signal. A MID+ switch allowed the player to shape the midrange character of that parallel clean path, giving the pedal a broader role in shaping the overall bass tone rather than simply blending an octave underneath.
The pedal operated on 9 volts DC and drew 14 mA, placing it well within the range of standard pedalboard power supplies. Three footprint voices — Girth, Growl, and Dry — each offered a range extending to full cut, giving the player precise control over how much of each voice reached the output. The MID+ switch added between +4 dB and +14 dB of gain at either 400 Hz or 850 Hz, selectable to suit the player's rig. True hardwire bypass was used, routing the signal directly past the circuitry when the pedal was disengaged. Input impedance was rated at 1 MΩ and output impedance at under 600 Ω, making the M288-U compatible with a wide range of signal chains without significant loading.
Owners tracing signal issues, replacing the DC power jack, or dialling in the MID+ switch behaviour against a specific amplifier should consult a qualified guitar or bass technician familiar with analog effects circuitry.
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