would this work for a 'sensitive' instrument like a 'piezo pickup' lap harp?...thanks

It'll work, but it's simply on or off type sound. It doesn't respond to playing quietly very well, it sounds like it has a noise gate that kicks in when you pick harder. If you want full on octave fuzz then it will do the trick. But not for dynamic playing such as a fuzz face.

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🔊 Command the low end, freak the crowd with the Blue Box™ Octave Fuzz!

CLASSIC ANALOG WARMTH - Rich, vintage fuzz tone that stands out in any mix.
COMPACT STAGE READY - Lightweight 227g design fits perfectly on your pedalboard.
PLUG PLAY VERSATILITY - Runs on a 9V battery or Dunlop’s ECB-003 adapter for hassle-free power.
UNLEASH CHAOTIC CREATIVITY - Each session delivers a fresh, unpredictable fuzz experience.
DIVE DEEP WITH OCTAVE POWER - Shovel out monstrous low frequencies that command attention.

The MXR M103 Blue Box™ Octave Fuzz is a compact, analog guitar pedal that fuzzes your signal and adds two octaves down for deep, powerful lows. Powered by a 9V battery or optional adapter, it delivers a uniquely chaotic tone that ensures no two performances sound the same.

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