Hi Jan Henk I have only had AN1X a few days......so bear with me! What you say is right "Control Matrix parameters apply to the internal tone generator only" However. If you look at the utility/setup and play with the device and ctrl no, theres an aftertouch (can change limit from 0 to 127). If I set this to zero...does it switch it off? I would like to switch off Aftertouch because I am using AN1X as master keyboard..... Thanks again David