The source key is your keypad, push button, etc. . It can only see one of these at the time. However, if you set one up as alt and another as 7, your pc will see that as a keystroke alt 7. The translates too is where you put in your = key. You do not want to use the Esc key for anything. Be warned, there are keys that will still perform your operating system functions with Mach running, or at least that is the way I understand it. I don't know if i told you or not but check out the thread there is a God, keygrabber axis gain question. It has the default grabber file I set up there. You can download it and rename it, drag it into your Mach folder, open it thru keygrabber and play with it. I will post a reply in it to bring it to the front.