The Keeley DS-9 has the famous SD Sonique Distortion and the DS Orange Distortion in one box. They are very similar styles of distortions, . The Orange pedal has more gain because it has the added transistor gain stage. The sick green pedal had a higher bass output that made tons of famous players happy because there was no low-end cut off. However, it suffered from low output volume (missing the transistor) and a limited tone control.

A combination of two legendary vintage sounds via a toggle switch, the DS-9's toggle controls a relay that moves circuit elements around to give you accurate recreations of those pedals without the flaws. There is also a Bass Cutoff Control to create new sounds by varying the amount of low end gain. It's easy to get a good Marshall-esque type of sound from this pedal and it does hard rock great.