EXPRESSION PEDAL ISOLATOR Platinum Edition

Harrison Laboratories Expression Pedal Isolators are specialized passive components designed for musicians—particularly organists and synthesizer players—who need to route expression control through multiple devices without introducing noise or grounding issues.

Core Function and Purpose

• Signal Isolation: They prevent "ground loops" or hum that can occur when an expression pedal is connected to two different pieces of gear (like a digital reverb unit and a classic organ console) simultaneously.
• Passive Operation: Like other Harrison Labs products, these isolators do not require external power and use high-quality internal components to maintain control signal integrity.
• Dual Control Routing: They allow a single expression pedal signal to be split or routed safely, ensuring that the "control voltage" or resistance from the pedal doesn't cause electrical conflict between the source and the receiving equipment.
• Technical SpecificationsWhile Harrison Labs often builds these for specific commercial or custom applications (such as for Allen Organs or custom studio rigs), they typically follow these standard hardware traits:
  • Form Factor: Similar to the FMOD™ line, they are often housed in compact, durable gold-plated or black metal enclosures.
  • Connectors: Available in RCA or 1/4" TRSconfigurations depending on the specific model, to match standard expression pedal inputs.
  • Input Tolerance: Designed to handle standard expression pedal resistance sweeps and control voltages (typically up to 20 Volts RMS max) without distortion.

Common Applications

• Organ Setups: Used to add modern digital effects (like Lexicon or TC Electronic units) to older electronic organs while keeping the original expression pedal functional for both.
• Pedalboard Management: Helps "clean up" complex MIDI or analog expression chains where multiple pedals share a single controller, preventing crosstalk.
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