Discrete F.E.T Hi-Gain Distortion and Overdrive Booster in ONE BOX. Think of them either as two separate pedals or as stages to be linked together
for endless combinations. The Hi-Gain side has Volume and Distortion
knobs with Bass, Mid, and Highs minipots. The Booster side has Volume
and Overdrive knobs with 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 amp-like, 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 FETs, 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 EQs 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

Why? A Clean Boost slamming into the front end a Distortion sounds
way different than a Distortion followed by the clean Boost... and when
the EQ's of the respective sides come into play, it's a wide open
canvas. Regardless of which side of the pedal is designated as "first in
line" you can still use each side by itself if you want... completely
independent of the other side.

Specifications:

Maximum Current Draw= 14 milliamps (all knobs cranked)

Weight= 1 pound 8 ounces

Size= 5 Ì´_" (left to right) x 3 7/8" deep x 2 Ì´_" height (top of Knobs)

Distortion side

Input impedance = 150K

Output impedance = 15K

Booster/OD side

Input impedance = 500k

Output impedance = 600 ohms