Hey all, I'm relatively new to Qt/Qwt and have a little experience with C++. I've written a program that has a spectrogram plot in it. I got the spectrogram to display my data properly, but the y-axis is in units of Hertz and I want to display it in Khz. I know I need to reimplement the QwtScaleDraw class but I am at a loss as to how it is done, can anybody explain the process to me? Thanks in advance.