In playing a music, the present electronic musical instrument stores a code for a performance event and data of generation time length until a presently-specified performance event is regenerated, in a sequencer memory. For each playback access to this sequencer memory, a performance event is excecuted...http://www.google.com/patents/US4901616?utm_source=gb-gplus-sharePatent US4901616 - Electronic musical instrument with delay trigger function
