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Discrete F.E.T Hi-Gain Distortion and Overdrive Booster IN ONE BOX. You could think of them as 2 separate pedals..or think of them as stages to be linked together for endless combinations. Hi-Gain side has Volume, Distortion knobs, Bass, Mid, and Highs minipots. Booster Side has Volume, Overdrive knobs, Bass and Highs minipots. (these new hi-Q sealed minipots don't break BTW) 

Hard clipped distortion (the way most pedals achieve distortion) at one point in a circuit can be cool, but stage after stage of FET (GT-500) is very real, very amplike, has ridiculous amounts of sustain even at low volume, does the great chunky low string rhythm stuff and cleans up incredibly well when you turn down the guitar's volume. The GT500 contains 9 x FET's, 2 Mosfets and 1 x Transistor with no opamps or clipping diodes used.

What's special about the EQ?

The Hi-Gain side has a discrete Inductor-Driven Midrange circuit....never been done in a pedal before. Yes there's a wah wah inductor inside the pedal that gives the Midrange control its ability to drastically increase or decrease the entire Low Mid, Mid, and Hi-Mid frequencies, to comical proportions. All this is done without any opamps because all of the active 3 Band EQ's I've tried are horrible, killing all harmonics, all excitement, and sounding as sterile as the "EQ" in a Digital Recording Program. Nope, this has 100% discrete matched FET's ;)

This Mid control mixed with a strong Bass and Treble control help give the GT-500 the ability to dial in more variations than a simple tone control, which can only roll off the Highs.

What's the "Series switch" in the middle do?

The Series Select Switch allows you to choose which pedal comes first  (allowing you to instantly change the order of the 2 circuits)

Booster ------> Distortion

or

Distortion-------> Booster