gsequencer 3.10.18 Advanced Gtk+ Sequencer
GSequencer allows you to play, capture and create music. There is a piano roll, automation and wave form editor. It has machines for playing drum samples, Soundfont2 sound containers and synthesizers. They usually can be connected to a MIDI input source (instrument). It has support for various audio backends like ALSA, Pulseaudio, JACK, OSSv4 and CoreAudio.