Rosegarden is a well-rounded audio and MIDI sequencer, score editor, and general-purpose music composition and editing environment.
Rosegarden is an easy-to-learn, attractive application that runs on Linux, ideal for composers, musicians, music students, and small studio or home recording environments.
Simple sinewave synthesizer triggered by an ordinary 16step sequencer. Each triggered step causes a force on the underlaying wave-map, which makes it more cute.