JAM Pedals updates RetroVibe to Mk4 with tap tempo and ramping
February 11, 2026 · 2 sources
JAM Pedals has updated its RetroVibe to the Mk4, adding a second footswitch for tap tempo and ramping and changing the enclosure orientation, according to Guitar Pedal X, which published on January 13, 20261. Delicious Audio covered the pedal on February 11, 2026, describing it as a significant update to the company's Uni-Vibe-inspired design2.
The Mk4 keeps the photocell-based modulation of earlier versions and offers chorus and vibrato modes2. Guitar Pedal X lists the controls as Depth, Chorus/Vibrato, Speed, a bypass footswitch and a tap tempo/ramping footswitch1. The tap tempo footswitch has an external input, and an expression pedal input controls speed in real time21. Delicious Audio reports that the ramping function sweeps between the current speed and a preset target speed2. It also reports a wider sweep on both the Speed and Depth controls than on the Mk32.
Guitar Pedal X reports that the enclosure changed from 1590BB vertical to 1590BB horizontal1. Delicious Audio describes the housing as JAM's etched enclosure2.
The US list price is $449, which Guitar Pedal X gives alongside euro and pound figures1. Guitar Pedal X reports the pedal is available now from the JAM Pedals webstore and international dealers1.
"The MKIV Retrovibe simply adds a second footswitch - for Tap Tempo and Ramping."
Guitar Pedal X's writer called the format change "two steps forward and one step back," saying he preferred the previous vertical layout, and described the price as relatively high1. Delicious Audio's review called the Mk4 a successful bridge between vintage character and modern functionality2.