The RetroVibe mk.4 is an all-analog Uni-Vibe-style modulation pedal with lush pulse, vocal shimmer and unmistakable vintage warmth. Expanded Depth and Speed ranges move from slow liquid waves to fast rotary-like spins, while Chorus and Vibrato modes provide two distinct ways to shape the movement.

Tap tempo makes the rate easy to lock in onstage, and the Ramping function glides from the current speed to a second user-defined rate for dramatic transitions. Connect a standard passive 10 kΩ expression pedal for continuous real-time Speed control. The mk.4 preserves the soul of the original RetroVibe while making it far more expressive in performance.

Chorus and Vibrato
The toggle selects Chorus for the classic pulsing phase character or Vibrato for pitch-focused movement.

Tap tempo and ramping
Tap the TAP/RAMP footswitch to set modulation speed. Hold it to ramp to a second speed; while holding, adjust Speed to set the destination and Depth to set travel time.

Expression control
A TRS input accepts a standard passive 10 kΩ expression pedal for continuous Speed control. A separate TS input accepts an external tap-tempo switch.

Level and startup
An internal trimmer sets maximum output level. The power-on state can be toggled by inserting power while holding the ON footswitch.

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