Ardour is an application to fit the needs of musicians under Linux. It is designed to be a fully functional professional audio application, that uses the professional sound server jack for sound i/o. Ardour requires liblo, raptor, liblrdf, boost, scons, fftw, libsamplerate, jack-audio-connection-kit, libgnomecanvas and aubio. If you want ardour with lv2 support pass LV2=yes to the script. This will additionally need slv2. All available from SlackBuilds.org.