I forgot to say I also documetned two functions fm-spectrum and rm-spectrum (fm and ring modulation). fm-spectrum has been in the sources but undocumented, rm-spectrum is new. the documentation is here: http://pinhead.music.uiuc.edu/~hkt/cm/doc/dict/fm-spectrum-fn.html http://pinhead.music.uiuc.edu/~hkt/cm/doc/dict/rm-spectrum-fn.html