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 _______________________
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