Refactoring proposal
First of all, thank you for your wonderful work!
I'm currently linting some of your code – removing extraneous whitespace, tweaking code style (camelCase -> snake_case, etc), moving some hardcoded values out as constants (where it makes sense) etc. I'm largely using https://wemake-python-stylegui.de/ as a guide, but adding a lot of exceptions where it makes sense. You can see the documentation on the rules it recommends, it is really well written.
I then plan to tweak the API to allow passing a pydub.AudioSegment directly and be more flexible overall. Would you be interested in accepting a PR with these changes?
You can see my changes here (compare).
It's a big change, so perhaps go commit by commit. I can open a PR if you want to review / discuss it.
Yep, it's looks pretty good. If you open a PR, I will check it tomorrow and merge