custom -"Also in my car when having the brain hooked up, for analogue 01, I get different voltages when pressing the buttons. The numbers seem to get to the next value faster even if I hit the button slow."
what do you mean?
Next Step is to start from scratch and create your own XML following the tutorial exactly as depicted. Create a keypress for each button you are going to use, but before going to your car and hooking everything up, test it on your PC using the virtual brain. Apply different voltages to your input using virtual brain and you should get the different keypresses you assigned to the input. Test all the voltage ranges you have set to make sure that all the keypresses are being sent (to note pad just like you did above when you got all the AAAAAA)
PLEASE do this before installing and trying in your car and post back the results. If you get the keypresses with your own XML then your XML document is fine. If you do not get any keypresses using virtual brain, then your XML is wrong.
Post back after you have tested your own XML using virtual brain (do not test in your car YET lol)