Is is possible to convert the files back to the original format (440Hz) instead of overwriting or ‘adding’ on top of the initial conversion? I basically want a do-over with the original file.
You didn’t save a copy of the original file? More processing will only make the distortion/artifacts worse.
FYI - Most people won’t notice a difference, especially if there’s a time delay between when they listen to the original and pitch-shifted file. Except they might hear the side effects. People with perfect pitch might notice a difference but perfect pitch isn’t really “perfect” and they might just mis-identify the musical key. A musician trying to play-along would notice that it’s off-pitch.