I wonder what the Peterson tunings actually do. On something like AP Tuner, you can build e.g. a Rast tuning, so that if you play e.g. E half flat correctly, it will show the note as E (not E half flat) perfectly
centered. In that way you might use AP Tuner to check your intonation a little easier while you play, because you can see the centered note easier
than if it's displayed as between E and E-flat. But it wouldn't be used for tuning the strings.
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