<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> <DIV>In a message dated 9/22/2004 11:49:24 AM Pacific Standard Time, pianote= ch88@yahoo.com writes:</DIV> <BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue = 2px solid"> <DIV><FONT face=Arial>Now, how exactly do you tune the fourth partial of t= he lower octave note to the second partial of the upper octave note?  I= have heard that some techs just tune the octave 1/2 a beat wide, and leave = it at that.</FONT></DIV> <DIV><FONT face=Arial></FONT> </DIV></BLOCKQUOTE></DIV> <DIV>Visually, by setting your ETD on A5, playing A4 and zeroing the tuner b= y "stopping the lights" or whatever. Then play A3. If the lights are still s= topped, you have a 4:2 octave, since A3 and A4 match at A5, the 4:2 coincide= nce (4th partial of A3, 2nd of A4).</DIV> <DIV> </DIV> <DIV>Aurally, by tuning so that the beat rate of F3-A3 = beat rate of F3-A= 4 (third-tenth test). What's happening is that F3 is producing its fifth par= tial at A5. It happens to be lower than the A5 produced by A3 and A4, so it = will beat against them. If it beats the same against both, they are producin= g a 4:2 octave. </DIV> <DIV> </DIV> <DIV>Bob Davis</DIV></BODY></HTML>