Different ETDs function differently. I've owned and used a SAT for many years and now a Verituner for many years. If you are purely relying on the ETD to calculate a tuning, you can start anywhere with the SAT because prior to tuning you "sample" three strings (different notes). From those three notes the SAT will then calculate a tuning. At that point you can start at A0, C88, A4, wherever and go anywhere - the calculated tuning will not change. In general, on a well-scaled large piano (are there any?), where there are note major compromises in the scaling, the SAT will produce very good results used like this. However on smaller and/or poorly scaled (and/or significantly compromised scales), the tuning will be improved with aural correction (like at the bass/tenor break on almost all pianos). However, the Verituner does its calculating differently. On a piano where you have not saved a tuning for (first time at the piano), one starts by sampling a number of strings/notes, much like the SAT - usually at least all the A's and strings adjacent to the bass/tenor break. Because the Verituner "listens" to all the notes and uses all the data (string partials) collected to calculate the next note, it is best to tune like an aural tuner does by tuning the temperament section first, then going up the scale, back to the temperament and then down. I believe RTC calculates a tuning very similar to the SAT, but rather than basing the calculation on three notes, you sample five notes. Not sure exactly how the TunLab works - I think very similar to RTC, but I don't know for sure. Hope this helps. Terry Farrell On Jul 3, 2010, at 5:07 PM, Susan Kline wrote: > >> when you start raising pitch from >> A0, > > > Pardon the ignorance of an aural tuner, but does anybody start from > the middle outward, or from the top down? Do the gadgets allow it? > > Susan > >
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