Description
The MXR M288 Bass Octave Deluxe hands bassists two distinct octave-below flavors instead of forcing a single generic tone. Growl dials in a throaty, midrange-forward octave that cuts through a mix, while Girth delivers a deep, smooth sub-octave for tracks that need floor-shaking weight. Since each voice is processed and controlled independently, you can blend them together or run either alone, tailoring the low end to the song rather than settling for a compromise.
Placement on the board matters with an octave pedal, and the M288 is built to sit early in the chain, feeding a clean, uncolored signal into your dirt and modulation. The Dry knob lets you set exactly how much of your original bass tone mixes back in with the octave voices, so you can go from subtle thickening to full-on suboctave doubling. Flip the Mid+ switch for up to +14dB of internally adjustable boost, choosing between 400Hz punch or 850Hz pop to help the effect sit right in a live mix or push through a dense arrangement.
Under the hood, MXR’s 18-volt Constant Headroom Technology runs off a standard 9-volt battery, giving the circuit studio-level headroom and tighter tracking even on fast lines or aggressive picking. True bypass keeps your tone unaffected when the effect is off, and the pedal is housed in the same rugged, lightweight aluminum casting and road-tested hardware that’s made MXR a pedalboard staple for decades.
- Dual independent octave voices: Growl and Girth
- Dry knob for blending clean and octave signal
- Mid+ switch with adjustable 400Hz or 850Hz boost (up to +14dB)
- 18-volt Constant Headroom Technology on 9V battery power
- True bypass, durable aluminum housing






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