Mario is correct, the difference is much less than even a half/step. Instruments hard tuned to 432 are likely a hundred years old, or made is a few countries in Europe.

The guitar can be tuned down, no problem, but it’s annoying. A piano normally could be lowered, once, from 440 to 432 but not the reverse and I wouldn’t want to be the tuner trying to bring it back to 440. A wind instrument just pulls out the tuning slide.


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