The Carbon Copy is a kick ass analog delay. But one thing that always bugged me about it is that it came with a Mod button to add pitch shifting to the repeats, yet even with the internal trims cranked it did basically nothing. What a waste. I wasn’t alone in this opinion and a while back MXR modded the pedal to add more Mod. It happens that the modification is very simple. But it’s not easy to find information on the Internet. The designer of the pedal (who goes by Mr. Huge) had posted info at one point, but I couldn’t track down what he said. However the V2 Carbon Copy MXR released has a jumper (000 resistor) in R7 instead of the 470K resistor and that’s all it takes! R7 is an SMD resistor (most of the components on the board are SMD). It’s located near the top of the board. Generally SMD circuits are difficult to work with, but in this case, don’t worry, this is easier to do than most through hole mods. You don’t even have to remove the circuit board. Put a little solder on your iron and hit the two sides of R7. It will slide right off. Grab it with tweezers. Solder a jumper in its place (you could use a small piece of solid wire, the leads from a through hole component, whatever). The trimpots controlling the modulation will now have a very usable range going from extremely subtle to rather noticeable. As it should have always been!