Keeley Compressor Pro — Studio‑Grade Dynamic Control for Guitar, Bass & More
Professional Compression in a Pedal
The Keeley Compressor Pro is a stompbox‑sized compressor/limiter engineered for both stage and studio use. Built in Oklahoma, USA, this pedal delivers true professional compression performance with a full range of controls, high‑quality signal handling, and studio‑level metering—making it indispensable for guitar, bass, keyboards, and even electronic instruments or vocals.
Unlike basic guitar compressors, the Compressor Pro is designed to match the noise floor and frequency response of top studio units, giving players and engineers precise control over dynamics and sustain.
Precision Metering & Feedback
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7‑Segment Compression LED Display: Shows real‑time gain reduction from ‑1 dB to ‑20 dB for clear monitoring
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Bi‑Color Threshold LED: Indicates when compression is active (red) and when input passes through unaffected (green)
This transparent visual feedback helps you dial in the perfect compression settings quickly and accurately.
Advanced Compression Engine
Exact RMS Analysis (ERA):
Keeley’s ERA circuit senses the true RMS value of your signal, responding to how humans perceive volume and dynamics—making compression feel musical and balanced across instruments.
Hard vs. Soft Knee:
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Hard Knee: Provides tighter, more aggressive compression and limiting—great for controlling peaks or adding strong sustain
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Soft Knee (Komfort Compression): Smooth onset compression that preserves musicality and avoids the “flattened” feel typical of conventional compressors
Auto Mode:
With Auto ON, the pedal intelligently adjusts attack and release times based on your playing and signal characteristics. This lets you get natural compression without constant tweaking.
Comprehensive Control Set
The Compressor Pro gives you detailed command over every aspect of compression:
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Threshold: Determines when compression engages, with an adjustable range from ‑50 dBu to +10 dBu, accommodating studio and instrument‑level signals
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Ratio: Adjusts how much compression is applied—from 1:1 (no compression) up to ∞:1 (hard limiting), useful for peak control or creative effects
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Attack: Sets how quickly the compressor reacts (0.15 ms to 150 ms)
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Release: Controls how fast compression eases off (0.1 s to 3 s)
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Gain: Adds make‑up gain—up to +20 dB—to compensate after heavy compression
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Knee Switch: Choose Hard or Soft Knee for character and response
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Auto Switch: Turn automatic attack/release on or off for manual control as needed
These controls give you full studio‑style compression flexibility, whether you want subtle leveling or aggressive dynamic shaping.
True‑Bypass Integrity
The Compressor Pro uses true‑bypass switching, ensuring no signal loss, coloration, or tonal change when the pedal is off. Your instrument’s natural tone stays intact.
Built for Every Rig
Designed with professional musicians and engineers in mind, the Keeley Compressor Pro works seamlessly in:
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Live pedalboard setups
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Studio recording chains
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Bass rigs needing tighter low‑end control
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Keyboard, synth, and vocal signal paths
Its robust construction and precise feature set make it ideal for players and producers who demand transparent, high‑fidelity dynamics control.
BOOM!
