From the DBA website, 
THE SUPERSONIC FUZZ GUN IS A COMPLETELY UNIQUE AND HUGE SOUNDING FUZZ PEDAL. THE GOAL OF THE PEDAL WAS TO MAKE A FUZZ WITH THE CAPABILITY OF HAVING AN IMMENSE RANGE OF GREAT AND USABLE FUZZ SOUNDS. THE CONTROLS ARE COMPLETELY INTERACTIVE WITH EACH OTHER TO GIVE THE WIELDER AN INFINITE NUMBER OF GREAT TONES. THERE ARE EXTREMELY (AND I MEAN EXREMELY) HARSH SOUNDS AVAILABLE AND EXTREMELY (YES I MEAN IT AGAIN) WARM SOUNDS AVAILABLE. IT DOES IT ALL. 

BIAS - CHANGES THE OVERALL SOUND OF THE FUZZING 
DENSITY - AFFECTS THE FREQUENCY RANGE GOING INTO THE PEDAL 
FUZZ - INCREASES THE DISTORTION OF THE SIGNAL 
FILTER - FILTERS OUT THE HIGH FREQUENCIES OF THE OUTPUT AND SMOOTHS OUT THE INSANITY 
LEVEL - CONTROLS THE MASTER OUTPUT VOLUME OF THE PEDAL 
GATE/OSCILATION - SWITCHES BETWEEN A GATED FUZZ TONE AND AN OSCILLATION FUZZ SOUND