Electro Harmonix Black Finger

The Electro Harmonix Black Finger is an optical compressor pedal that uses a vacuum tube in its gain stage, distinguishing it from typical solid-state compressors. Its primary controls are Sustain, which sets the compression ratio by determining how much the signal is attenuated when it exceeds the threshold, and Volume, which adjusts the output level to compensate for the compression-induced loss. A Sensitivity switch toggles between low and high input headroom, affecting how readily the compressor responds to picking dynamics. The pedal operates in a true bypass configuration, preserving the dry signal when disengaged. It requires a standard 9V power supply and features a compact, rugged enclosure suitable for pedalboards.

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