The Jam Pedals Retrovibe Mk4 is a significant update to the company's respected Uni-Vibe-inspired pedal, refining its classic, photo-cell-based modulation for modern playability. It delivers the quintessential, warm, three-dimensional swirl associated with vintage "vibe" units in both lush chorus and throbbing vibrato modes, with notable improvements in tonal depth and range over earlier versions.... Click on the title for more