I don't know about that BW claim. Back when mp3 was new and computers usually had floppy drives I did the obvious and mp3 bitrates above 64K or so tended to stutter and significantly below 64K did not stutter.

Something like voice encoded at 32K sounded at least as good as a phone and played back off a 1.44 floppy and IIRC that was about the best that could be done.

You will probably be surprised how long an audio recording can be, if its voice at a low rate on one floppy. If you go variable bit rate and silence detection I subjectively remember "ten minutes" was quite reasonable on a 1.44 disk.

Extrapolating from historical experience, thirty or so in parallel should push over half a meg/sec quite reliably.

If you record speech onto a floppy drive off a cheap mic you'll record the sound of the floppy in the recording, which is funny to me.

I wish I still had those files. Useless, of course, but would be funny.