Advanced Gtk+ Sequencer 0.4.2 is out
Check download at:
http://sourceforge.net/projects/ags/files/ags-0_4_2.tar.bz2/download
or API Reference by issuing:
http://ags.sourceforge.net/api/ags/index.html
Advanced GTK+ Sequencer is intended to use for music composition. Use
its piano roll, synth, matrix editor, drum machine, soundfont2 player,
mixer or the output panel.