In the words of MXR:

The MXR Timmy Overdrive provides a huge, responsive range of gritty and textured tones that enhance the sound of your rig while preserving its fundamental characterand in an MXR mini housing, this pedal will free up some serious pedalboard space. Its based on a design created by veteran pedal builder Paul Cochrane thats widely celebrated among high level pros, from first-call Nashville session player Kenny Greenberg to first call L.A. player Lyle Workman to rockstar Brad Whitford.