I finally managed to put my MidiCV-interface components into a case, but unfortunately the buttons don't work anymore now. They have been fully functional before >:( So far, I haven't figured out the reason. I guess, something is wrong with the communication of the DINX1 and the CORE module. I have taken the modules out of the case again and made some measurements. This is what I have found out: - Pressing the buttons on the DINX1 pulls the inputs from 5V to 0V. - There is a clock signal at the DINX1. - The LD-Line of the DINX1's shift register is constantly 5V, no matter if a button is pressed. - The serial output of the DINX1 is a rectangular signal, which loses amplitude when one of the 4 buttons is pressed. Can anybody tell my, if that sounds correct so far? Seems like I'm lacking some basic knowledge here...