With the diode Toggle Switch you have the DS-ULTRA! Huge tube like tone, switch back and you have the classic Seeing Eye Mod (SEM) version of the pedal for high gain, tube like distortion!

* Extra mods to increase the distortion range at maximum settings. 

* Mods to correct the bass response and give you a fuller, more powerful tone. Perfect for Strats now with this mod!

* Comes with Cool Knobs! 

* Toggle Switch Up - Our Standard Seeing Eye Mod. 

* Toggle Down - Adds another LED to the clipping circuit for a Large Fat Tone. 

The Extra LED increases the volume output of the pedal a bit, great for using the DS-1 as a pre-amp to push the amp or to fine tune a low distortion sound on the unit. The way we engineer the mod, it has increased 2nd order harmonics and tube-like qualities.