I don't mean to lose my 'temper' here, but I think gp is hoping Note.freq(), Note.fromFreq(), etc. aren't locked into A440 as the examples imply. While >99% of the library doesn't deal with this at all, it would be handy nonetheless. Unfortunately, it's currently hard coded:

https://github.com/tonaljs/tonal/blob/main/packages%2Fpitch-...

https://github.com/tonaljs/tonal/blob/main/packages%2Fmidi%2...