The Vertex Ultraphonix MKII is an overdrive pedal designed to emulate the tone of a Dumble™ Overdrive Special (ODS) amplifier. It allows users to blend clean and distorted signals and offers a warm, open sound with a unique mid-range that is distinct from other overdrive pedals like the Ibanez Tube Screamer and Klon Centaur. The MKII version is smaller and incorporates a RATIO control for tonal flexibility.
Guitarists were highly impressed with the Ultraphonix MKII, praising its ability to replicate the Dumble amp sound with a creamy and open tone. They found it to be a significant upgrade from the original version, and enjoyed the RATIO control for tonal versatility. Users appreciated the pedal's ability to work well with various guitars, including Stratocasters and Les Pauls, and noted its ability to deliver a pleasing overdrive sound. While some found the footswitch to be a little clicky, overall, the pedal was celebrated for its sound quality and build.