Related to: #129

Python (and by extension, pydub) cannot handle audio with frame rates over 48k. That's a bummer.

We could use ffmpeg to convert the framerate down to 48k in those cases, but users with 96k files on disk are probably not going to be happy with that solution.

I wonder if there is a way to solve this without reimplementing the functionality in audioop. Maybe if we just lie about the framerate to audioop it will work fine?