JAM Pedals RetroVibe MK4

The RetroVibe has long stood among the most revered Uni-Vibe interpretations ever made, celebrated for its lush pulse, vocal shimmer, and unmistakable warmth.

The mk.4 continues that legacy. Its all-analog design preserves the soul of the original while expanding its expressive range. A wider Depth and Speed span, plus new Tap Tempo and Ramping functions, invite deeper interaction and performance freedom.

Switch between Chorus and Vibrato modes to explore everything from slow, liquid waves to fast, rotary-like spins — always alive, always unmistakably RetroVibe.

Plug in a standard passive 10k expression pedal for real-time control of modulation Speed, and shape the sound as it moves.

A prolonged press of the TAP footswitch engages ramping from the current speed to a fixed, user-selectable speed.

To set the fixed speed:

• While keeping the TAP footswitch pressed, adjust the Speed knob to taste.
• After releasing the TAP footswitch, return the Speed to its original position.

To set the ramping time (how long it takes to travel between speeds):

• While keeping the TAP footswitch pressed, adjust the Depth knob to taste.
• After releasing the TAP footswitch, return the Depth to its original position.

CONTROLS

• DEPTH – Sets how deep the modulation sweeps.
• SPEED – Sets the rate of modulation.
• Toggle switch – Selects Chorus (C) or Vibrato (V) mode.
• Internal trimmer – Adjusts the maximum output level of the effect.
• TAP – Allows you to tap in the modulation speed or access the ramping feature.

EXPRESSION PEDAL INPUTS

• TS jack → External Tap Tempo footswitch.
• TRS jack → Speed expression pedal - (standard passive 10k).