[LAD] help with RtMidi and gtkmm

Hi, I'm learning to write simple audio/midi applications in C++ with RtMidi and gtkmm libraries (version 2.4). This is the application I'm working on: http://www.eclepticbox.altervista.org/index.php/download/finish/2-audio-mid… I got some issues with RtMidi IN (Callback). I followed the RtMidi tutorial and the VMPK example (however this is written with Qt), but the problem is that the GUI freezes when I send some MIDI data and it doesn't refresh the widgets values. Midi Out works properly. I think the problem is in the Midi Callback and in the event/signal managing. I tried some function in order to refresh the gui but they didn't work. This is the smallest extract of code that has the issue (only a spinbutton sending / receiving MIDI Program Change): http://www.eclepticbox.altervista.org/index.php/download/finish/2-audio-mid… The sources are in the src folder, see: sawlidsyngui.cpp sawlidsyngui.h Any help is appreciated.... Thanks ... Alessandro