TS7 Tube Screamer "Less Drive at Zero" Mod
I typically use my TS7 as an overdrive pedal to give a bit of boost to a clean signal. I have other pedals for the heavier distortion (although the TS7 'hot' mode is handy sometimes). When I firt used the pedal, I thought that putting the Drive control on Zero would pretty much remove the distortion of the pedal. But it didn't really. At least not enough for me. Even on zero, the pedal still put out too much crunch. On zero now, there is just a hint of overdrive, almost inaudible when playing single notes but just a little bit gritty when chording, bending, doublestopping. This mod dropped the distortion level of the pedal at zero to allow me to get the slight overdrive I want and still keep the same upper level distortions for when I might want them. This mod works for me and I make no guarantees that it will work for anyone else. Use it at your own risk.
See Robert Keeley's TS-7 Tone Lok Mods page for more detail.