Quote:
And wouldn't such interface add complexity and another point of failure?


Yes and no.
It does add complexity (which also means flexibility) and another possible point of failure, but the possibility of a dedicated interface failure compared to an 1/8th inch connection jack failure (or half failure like crackling etc) .. I'd take the USB hardware device in most instances.
Just my opinion.

The 1/8th inch may be able to be a 'catastrophe' backup option.

But as Eddie mentioned, this isn't achieved in an MP3 player setting; you'd need a machine to run the USB audio device (drivers).

Though I have used the Android RB app (historically) to have such fun, I don't think it is supported anymore.
You'd have to go to some pretty sketchy places to find it now .. and even then, use 'developer mode' on Android to allow it to install, so those days seem to be gone for most users.
It still required a computer within WIFI range, but was a fun Android solution while it lasted.


I do not work here, but the benefits are still awesome
Make your sound your own!