Best Answer:
Without an adjustable tuner it's pretty tough to be accurate. If you have an adjustable electronic keyboard you can guesstimate with that. The good news though is that the difference between A440 and A432 is very negligible. Here's the math. According to my J. Cree Fischer "Piano Tuning-A Simple and Accurate Method for Amateurs" p.148, the formula for figuring out a major 7th higher (in this case G#-Ab) would be f x 15/8. (f=frequency) We know that half of A440, or A220, would be an octave below. When we multiply 220 x 15/8 (1.875) we get 412.5 for the frequency of Ab. 440-412.5=27.5 If we divide 27.5 by 8 (440-432) we get 3.44. this means that dropping A down to 432 will only drop the pitch less than 1/3 of a semitone (half step). Not much! Now after all that, here's a simple test. Record yourself with these two tunings and do a "blindfold" test. See if you can tell the difference. In the U.S. the standard is A440. In other countries around the world there is some variation but it us usually up to A445 or so. My personal opinion is that there's not much noticeable difference in the sound until you drop the tuning a whole step and put the strings to D-G-C-F-A-D (from 6th to 1st) or even just drop D tuning (lower 6th to D). I hope this has been more helpful than tedious! joeteach123

Source(s):
J. Cree Fischer "Piano Tuning-A Simple and Accurate Mehtod for Amateurs" p.148

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