I know about the 432 Hz ‘God Note’ alternative tuning that is supposed to give enhanced listening pleasure by fully accessing the link between music and emotion. See here, for example.
And I know that the standard music tuning in ‘Western’ culture is 440 Hz.
So what is “438 Hz Enhanced Audio”? I’ve recently been seeing what appear to be selected album reissues labelled as such, but don’t know if it is a studio treatment or a reissue brandname.