[linux-audio-dev] RME totalyser clone ?

Hi there, I am currently a DSP student, and want to program some stuff to improve my programming skills on linux plateform. As several musicians friends told me they would want a RME totalyser -like software (see http://www.rme-audio.com/english/analyzer/totalyser.htm), I'd like to start with the same kind of software. It is basically a goniometer, a 30 bands frequency analyser and RMS peak analyser. Here are my questions: - Does this kind of stuff already exist on linux ? - As I'd like to make the program work on linux and win32, I didn't see many choices for the GUI toolkit: wxwindow and gtk/gtkmm. I heard that gtk/gtkmm doesn't work well on win32 plateform, is it true ? - I feel confortable with the pure DSP part of the soft, but as I don't have real experience in GUI programming, the GUI part seems more difficult. Where to start to handle waveforms drawing, level meters ? If I am using wxwindow, I know I can look at the sources of audacity, but other sources would be useful. Thanks, David