Info from MI Audio about their original:
MI Audio settled on a design which makes the GI Fuzz one of the most versatile fuzz pedals out there. At last, the fuzz pedal has joined the 21st century! No longer the 2 knob, unstable, radio receiver of yesteryear. You get 6 knobs, an internal trimmer, a 3 position switch, and the ability to create anything from fat bluesy tones, to traditional fuzz, to all-out sustain, to gated, synth-like bleeps.
High Gain silicon fuzz.
Fuzz generated by a trio of high gain silicon transistors
Ultimate flexibility with the following 8 controls (1 internal):
● Fuzz - from nothing to all out fuzz
● Load - input impedance control
● Bias - controls the bias of the 2 transistors
● Body - midrange control
● Tone - balancing control for controlling highs and lows
● Bright switch
● Internal Gain trimmer.
Professionally powder-coated and silk-screened enclosure, measuring only 4.3" x 2.2"
IN DEPTH CONTROL DETAILS FROM MI AUDIO:
A huge gain range, from nothing to sustain-for-days
It can be used as a low gain device (for a fat bluesy bite), which is fairly unique for a fuzz pedal, since fuzz pedals tend to have a very narrow range of gain.
To tame this pedal, there's an internal gain trimmer to wind things back (which I recommend)
Load control, which is a variable input impedance. This can be used to match the GI Fuzz to humbuckers as well as single coils (Fuzz pedals tend to have low input impedance which is a better match for single coils. Now you can also use humbuckers without any problems). You can also use it to go from a tradition fuzz sound (low input impedance) to a more articulate sound with detailed highs (high impedance)
A bias control to set up the operating point of the transistors, from a fat symmetrical fuzz, to an asymmetrical 'mosquito' buzz, and beyond, to a gated synth-like sound (almost sounds like your amp is about to die!)
Body control, which full range mid range control. The mids, of course, are the most important frequencies for determining how your guitar tone sits in with the rest of the band.
Tone control, which controls both lows and highs, as opposed to simply a high cut filter. This is like bass and treble controls rolled into one. The combination of the tone and the body controls is like having a low/mid/high EQ
Volume control with output to spare. You can use the GI fuzz to overdrive your amp.
3 position bright switch to help tame the top end. This is useful if you're going to use your GI Fuzz with a bright 'modern' voiced clean channel, or if you're going to use the GI with overdrive pedals (which tend to be darker, and by comparison, make a normal fuzz sound shrill).