I'm trying to use the nn to go back and forth between frequencies and note numbers, but I'd like to base it on my A (69) being 442 hz and not 440 hz. Is it possible to change it? I imagine there would be people who'd like to change to 432 hz and other base frequencies.
And what is the reason that the A is 440.0000583572d hz and not 440 hz? It's precise enough for me, just curious.