The Electro‑Harmonix White Finger XO Compressor is an analog optical compressor pedal housed in a compact die‑cast enclosure, handcrafted in the USA. It uses a FET‑based compression circuit modeled after EHX’s studio-grade NY‑2A design, offering transparent sustain without coloring your attack. This version operates on the included 40 V DC adapter only—no battery needed. Dual optical sensors let you choose between LED mode for fast, punchy compression and Lamp mode for a slower, more musical bloom, with an additional Squish function in Lamp mode for extended attack and heavier compression. Controls include Compress (amount of compression), Sensitivity (how aggressively the circuit responds), and Pre‑Gain (input drive level). True bypass switching ensures clean signal when off. This XO version reduces noise compared to older steel‑boxed units and delivers reliable, full‑range compression in a more pedalboard‑friendly size.

Users often highlight its tonal versatility: the LED mode yields tight, articulate sustain ideal for rhythm or lead lines, while Lamp plus Squish produces rich, funky squash tones. Some caution that certain combinations can raise the noise floor, so dialing in the balance of tone versus hiss is key.

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Power supplies are not included, unless described or pictured. All items have been tested and function 100% unless stated otherwise.

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