Hello, This sounds interesting, I would certainly like to check percent changes as easily as that. So far, I have used different ways. But, to find the "height of the waveform", should I use somekind of Max-Min from the design.mat or what? In my case, I have typically some seven or eight blocks with rest 5s, act 2s and so on. What would your suggestion be? Regards, Pasi Tuunanen