"The first control, a (blend pot) control that will take you from vintage Dallas Rangemaster to 67 Ge fuzz face heaven and everything in between, even tweed amp tones are in there. 2nd control is a saturation blend. 3rd is a Master volume. A very versatile unit that can blend many different shades of Ge fuzz face, Dallas Rangemaster, Distortion, Overdrive, Flat boost, Warm clean boost. the possibilities are endless..
Stable Handpicked Germanium mil spec transistor ensures the smoothest, harmonically rich, musical amp like tone available, ANYWHERE.
Internal trim pot lets you select the bias at anytime.
The BBB is really an interesting pedal.
While it has an un-mistakable vintage tendency, it also has a unique voice. It blends a germanium treble booster and a fuzz in a single pedal. Not only do you have these two tones at your fingertips, you can BLEND them. This may sound simple, but the results are nothing short of stunning. This mix makes for some very tasty fuzz/boost tones. The pedal is remarkably tunable for having just three knobs; Vol, Fuzz, Blend."
And here's a demo video of the BBB 07, Dragon e.t.c in action:
Here's some images of the pedal, an instruction/setting image and the schematic:
As the schematic suggests the transistors type was swapped about in different versions. Try as many as you like until you find a decent sound. It's just a simple fuzz face type circuit but it is a good sounding variation..
Here is the freestompboxes forum: http://www.freestompboxes.org/viewtopic.php?f=7&t=12734