Two bits of feedback:
i loathe SaaS - software as a service - so I will never subscribe to Vox Premium.
I use your free version constantly and would happily make a donation for it.
I would also happily pay for a premium app as a one off purchase, and pay for major updates…
Cloud storage has no interest for me whatsoever, and neither does signing up to a subscription.
I often run multiple copies of Vox
I want to be able to audition and then crossfade from one song to another
now THAT would be a feature/s for a Premium app that i would pay for.
ie multiple playlists open at the same time, with audition and crossfade
I still would not subscribe to a SaaS business model though.