thanks! Well, I will try and find some kind of number on them. I read that these are called "rotary encoders" because they are digital, sending MIDI etc. Can those also be measured with a multimeter? By the way I dont even know what a multimeter is and how to use it but should not be hard to use I guess :) Will let you know about what happened. I hope I can tell the difference between pots and encoders. Anyone any other suggestions?