The Vertex Ultraphonix is an overdrive inspired by ultra-rare (and ultra-cloned) Dumble Overdrive Special amp. The HRM (Hot Rubber Monkey) version of this pedal emulates a particularly popular tube mod implemented on a limited number of those amps that resulted in a modification of the mid-range that brought it closer to the one produced by a British-style tone stack (read, a Marshall amp).... Click on the title for more