Source Audio SA228 Soundblox 2 OFD Bass microModeler Diverse Sound Palette -Featuring extremely natural modeling of 12 bass versions of classic overdrive, fuzz, and distortion tones Compact, cast aluminum housing and 2 User Presets easily recalled via two footswitches Clean and dirty MIX control to blend the effected tone with the original dry signal plus Lo-Retain: Source Audios low-end retaining algorithm 3-band tone control -select between "treble", "mid", and "bass" for precision tone sculpting and easily activated 3-level noise gate Selectable buffered or true bypass and a Multi-function input to use an expression pedal or the Hot Hand Motion Sensor to morph between presets or manipulate any of the six assignable parameters