Dear Dave-- I have long appreciated your thoughtful, respectful, mature, and wise posts to this list. I know that SMU will miss you, but I wish you all the best in your well-deserved retirement, and hope that you will continue to share your experience and knowledge with your colleagues on this list. Warm regards, Charles On Apr 13, 2010, at 6:30 PM, Porritt, David wrote: > Ron wrote: " The ETD uses the fundamental to determine the pitch, > and will not be 'listening' to the fifths, fourths and tenths which > will be annoying the aural tuner at the break transition.” > > Your observations about the hockey stick bridges and inharmonicity > jumps are totally correct. However no ETD that I am aware of > listens to the fundamental in the hockey stick area. SAT is > listening to the 4th partial, TuneLab is flexible and can listen to > any partial the tuner determines, but I’m not aware of anyone > setting TuneLab to listen to the fundamental in that area. My > choice was the 3rd partial in that area. The Verituner supposedly > listens to multiple partials though I’ve never used one so I can’t > verify that. > > Listening to the 3rd of 4th partial seems to help that area to be > somewhat less bad that if it really were listening to the fundamental. > > I still believe that once you solve the puzzle on a given piano it’s > nice to be able to save that solution for next time rather than > solving the same puzzle over and over. Before I retired from SMU my > life consisted of maintaining 106 pianos. It was quite a time and > energy saver to pull out a saved solution for subsequent tunings > rather than tuning as if I had never seen the instrument. > > dave > > > David M. Porritt, RPT > dporritt at smu.edu > > > -----Original Message----- > From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf > Of Ron Overs > Sent: Tuesday, April 13, 2010 4:01 PM > To: caut at ptg.org > Subject: Re: [CAUT] using as ETD > > Jim wrote; > > >. . . and truthfully, sometimes the ETD just ain't right! I've got a > >SATIII and a Verituner and especially at the break I'll occasionally > >disagree with the machines. I really don't know why, and maybe the > >real good ETD guys can tell me, but sometimes I hear strong beats > >that are objectionable . . . > > I'm strictly a 'fork basher' Jim, but I'd like to follow up on your > observation. The ETD's stretch calculation is based on the > inharmonicity following a geometric curve, which certainly doesn't > happen at the break when a hockey stick long-bridge is incorporated > into the 'design'. When tuning down towards the shortened speaking > lengths of the hockey stick, the rapidly falling tension will result > in the inharmonicity rising up, away from the geometric curve of an > idealised scale. The fifths will appear to be increasingly narrower > than they are on account of the sharper I(3) in the lower note of the > fifth - when checking the fifth, or the I(5) when checking the tenth. > The aural tuner will compensate by slightly widening the octave to > achieve an acceptable beat-rate progression. Similarly, when the > lower inharmonicity of the first covered notes are encountered, > especially if the first covered strings are on the hockey stick, the > aural tuner will tend to make these octaves slightly less wide, to > prevent the fourths from beating wildly. The ETD uses the fundamental > to determine the pitch, and will not be 'listening' to the fifths, > fourths and tenths which will be annoying the aural tuner at the > break transition. > > If a technician can't tune a piano without the help of ETD, it will > be most unlikely that he/she will be capable of obtaining an accurate > tuning with one. Especially at the break of some pianos. > > Its amazing how some technicians, who use ETD, claim that their > tunings will, by virtue of the machine, be superior to an aural > tuning? Ironically, it gives me an indication of the aural tuning > skills of any ETD-technician who makes such a claim. > > Ron O. > -- > OVERS PIANOS - SYDNEY > Grand Piano Manufacturers > _______________________ > > Web http://overspianos.com.au > mailto:ron at overspianos.com.au > _______________________ Charles Ball, RPT Head Piano Technician The Butler School of Music The University of Texas at Austin 1 University Station, E 3100 Austin, Texas 78712 512-471-0763 (office) 512-923-2311 (cell) -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/caut.php/attachments/20100414/39db9345/attachment-0001.htm>
This PTG archive page provided courtesy of Moy Piano Service, LLC