I actually change component values and not just the the caps....Resistor values get changed,as does the original chip.There's a chip holder in the pedal so if you wanted to try a different chip,you can just pop the new one in really quick...The modded version has more lows,is smoother overall,quieter,and it has a night and day better tone over the stock unit..It's like a Tube Screamer,but is more aggressive in the gain,but the circuits are very similar..The modded SD1 seems to have more "grind"...The TS is smoother and more compressed sounding by comparison.