It depends on Qt 2.2.x from Trolltech and libfftw from fftw.org . To run MQ3, just type the executable name. Of course, the standard Qt commandline arguments work. To get MQ3 to play your music, you have to load them into the Organizer. A song is the thing that gets played.
Songs have to belong to a group .
If have a group or song already highlighed, then pressing the add button will ask to add a song to the current group. Actually, no you don't. New in MQ3-8, you can drag and drop files from another application onto the Organizer. The next time you start MQ3, it will reload the settings. And the obligatory screenshot.