<HTML><HEAD> <META charset=US-ASCII http-equiv=Content-Type content="text/html; cha= rset=US-ASCII"> <META content="MSHTML 6.00.2800.1106" name=GENERATOR></HEAD> <BODY style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; BACKGROUND-COLOR: #fffff= f"> <DIV>A double augmented 7th is actually a little wider than a perfect octave= . On the piano you can't make the difference of course but B# is really one = comma higher than C. </DIV> <DIV>And Dbb is one comma lower than C so no a diminished second is not a pe= rfect unison.</DIV> <DIV> </DIV> <DIV>Jean-Luc Matton </DIV> <DIV>Albuquerque NM</DIV></BODY></HTML>