JAM Pedals RetroVibe mk.4 – All-Analog Uni-Vibe with Tap Tempo & Ramping

Chorus/Vibrato · Expanded Depth & Speed range · Tap Tempo · Ramping · 10k passive expression control (Speed)

The JAM Pedals RetroVibe has long been regarded as one of the most revered Uni-Vibe interpretations out there, loved for its lush pulse, vocal-like shimmer, and unmistakable warmth. The mk.4 keeps that legacy alive with an all-analog design that preserves the soul of the original, while expanding the pedal’s expressive range for modern performance.

You get a wider Depth and Speed span, letting you explore everything from slow, liquid movement to fast, rotary-like spins — always alive, always unmistakably RetroVibe. New Tap Tempo makes dialing modulation speed on the fly effortless, while Ramping lets you transition from your current speed to a fixed, user-selectable target speed — perfect for dynamic passages, swells, and expressive live control.

For real-time modulation shaping, simply connect a standard passive 10k expression pedal and take control of modulation Speed as you play.

Key features

• All-analog Uni-Vibe style modulation with the signature RetroVibe pulse and warmth
• Switchable Chorus / Vibrato modes
• Expanded Depth & Speed range for deeper interaction
• Tap Tempo for on-the-fly modulation speed control
• Ramping between two speeds via the TAP footswitch
• 10k passive expression pedal support (Speed control)
• Internal trimmer to set maximum output level

Technical specifications

• Type: Uni-Vibe style modulation (chorus/vibrato)
• Signal path: All-analog
• Controls:
• Depth (modulation sweep depth)
• Speed (modulation rate)
• Chorus (C) / Vibrato (V) toggle
• Footswitch:
• TAP (tap tempo + press-and-hold ramping access)
• Internal adjustment:
• Internal trimmer for maximum output level
• External control:
• Compatible with standard passive 10k expression pedal (Speed)

Find the JAM Pedals RetroVibe mk.4 and a carefully curated selection of boutique pedals at onemorepedal.com, your specialist store for high-end guitar effects.

A classic Uni-Vibe that plays like an instrument.