I picked up a Taiwan made SD-1 for $10 quite a while ago. They make nice loaner pedals for jams and what not, but I hadn't really used it in forever. I go to looking at it the other day and thought "Why not?" and popped it open. I changed out C2 and C3 for a military grade 0.1UF cap, and removed C6. I cleaned up a couple connections too. This added more bass and removed the blanket. WOW! Its actually a REALLY good sounding pedal now! it still has a touch of the mid hump in it, but it doesn't sound so flat and one dimensional now. whatever bass goes in is also what goes out, and the tone knob now responds like a normal tone knob. A really solid sounding pedal that I might try out live soon - I'm impressed!