JAM Pedals RetroVibe Mk4 Univibe

The JAM Pedals RetroVibe Mk4 continues one of the most respected Uni Vibe style designs ever produced, preserving the lush pulse, vocal shimmer, and warmth that defined earlier versions while expanding its performance focused feature set. Fully analogue at its core, the Mk4 stays true to the character of the original Uni Vibe circuits, delivering deep, swirling modulation that feels alive and responsive under the fingers.

Built with premium analogue components and classic design principles, the RetroVibe Mk4 offers a wider range of Depth and Speed than previous versions, allowing everything from slow, liquid movement to fast, rotary style textures. Chorus and Vibrato modes provide distinct flavours, with Chorus delivering a rich, three dimensional swirl and Vibrato offering a more direct, pitch shifting modulation reminiscent of worn vintage units. A new Tap Tempo function makes it easy to sync modulation speed in real time, while the added Ramping feature allows smooth transitions between speeds for expressive, dynamic effects during performance.

The RetroVibe Mk4 also supports a standard passive 10k expression pedal for real time control of modulation speed, making it ideal for live use. An internal trimmer allows adjustment of the maximum output level while subtly shaping the overall response of the effect, retaining its unmistakably vintage voice.

Controls
Depth Sets the intensity of the modulation sweep
Speed Sets the modulation rate
Toggle switch Selects Chorus or Vibrato mode
Tap Tap in modulation speed and access ramping function
Internal trimmer Adjusts maximum output level

Ramping function
Press and hold the Tap footswitch to ramp from the current speed to a fixed user selected speed
While holding Tap adjust the Speed control to set the target speed
While holding Tap adjust the Depth control to set the ramp time

Other information
Supports standard passive 10k expression pedal for speed control
Compact pedalboard friendly enclosure
Standard 9v DC operation internally increased for enhanced headroom