The BOLO is a harmonically rich, heavy overdrive with a fuzz capability. It provides a snappy, fast responding overdrive when playing chords and a bold, singing fuzz tone when soloing. Two silicon transistor boosts cascade into one another creating a ton of tone. The controls PRE and POST act as one would expect on a master volume amp, the PRE adding dirt and gain with the POST controlling overall volume. The FUZZ control mixes in clipping diodes which add a dimension to the pedal's distortion tones. The FUZZ fully engaged will reduce output which can be restored and expanded by turning up the post. In the highest setting of the PRE, the signal is pinched into an almost velcro-like fuzz tone. Harmonics pop up and fill in between notes, creating exciting and fun tones to play.