Ground Zero Modded SLO-100 very few of these out in the wild. Comes with original box pedal. Amp rips and not only are the rack SLO-100 sound better stock than the heads to my ears the GZ mod takes it to another level! Only selling because a holy grail guitar popped up and I have to make room.

More info on the mod can be found here:

From the site:

"A juicy, harmonically rich SLO, with added tightness and more usable gain. Turning the gain past 5 or 6 has always been a challenge without too much bass and lack of definition on a stock SLO. Turn the GZ SLO up to 10 and it remains composed, with tons of clarity all the way through the range of gain. 

The clean/ crunch channel is also tweaked to better match the more dynamic and tighter response of the high gain channel. 

No holes drilled for the mod."

A "Pull Gain Cut" feature added to the bass control adds a lower gain, more open texture to the higher gain channel. Great for getting into more of a rock or blues type territory. 

"Pull SAT" on the treble control adds a diode clipping circuit for more saturation and a higher gain feel. 

The (-) FB control adjusts the response of the power amp section, giving a much wider palette of tones from the circuit. From dark and smooth, to brighter and more aggressive and raw.