Hello again František, Just to let you know -- I was a bit annoyed that clicking the scroll wheel sent the same code as clicking the middle button, and playing a bit with your code, I found a way to have every button send a different code to the computer, including the one behind the scroll wheel. As reported by xev, I now have the following: Left button = 1 Middle button = 2 Right button = 3 Scroll forward = 4 Scroll backward = 5 Back thumb button = 8 Front thumb button = 9 Clicking the wheel = 10 Button behind wheel = 11 All I needed was to change a couple magic constants in your code. Specifically, lines 83 and 86 of CadMouseConfig.h need to be changed to: data.push_back(0x0f) and data.push_back(0x10) (constants were 0x0c and 0x2f previously). I don't know if that works on the Pro version as well, but feel free to add this to your code if it does.