Gain rises with harder picking, and rolling the guitar volume back reduces the drive. The BD-2 can also sit as a full-range boost in front of other drives or high-gain amps when a mid-hump is not wanted.

Higher gain can turn fizzy, and the Tone control can sound harsh or lifeless at the extremes. A Tube Screamer mid-hump pairs well when more saturation is needed for leads.

The Waza Craft BD-2W keeps the same Level, Tone and Gain layout in an enclosure of the same size. Its revised circuit is all-discrete analogue, and a mode switch adds a second voice. Standard mode follows the BD-2 sound, while Custom mode adds body and sustain. The BD-2 has a single voice and no mode switch.