An initial note series is collected from a real-time source of musical input material such as a keyboard or a sequencer playing back musical data, or extracted from musical data stored in memory. The initial note series may be altered to create variations of the initial note series using various mathematical...http://www.google.com.tw/patents/US6103964?utm_source=gb-gplus-share專利 US6103964 - Method and apparatus for generating algorithmic musical effects
