demodulating audio cassette wav files

[der Mouse]

> I have some cassette tape audio files using 300 baud 8/n/1 format
> simple fsk 1200/2400Hz I think.  Same audio you would find on a
> cassette tape for program storage except in a wav file.  Any easy way
> to demodulate it back into data?

Sounds as though it should be simple enough, unless the digitization
sample rate is really marginal (8KHz would be pushing it, I'd say).  If
you don't mind sending me a fragment of the digitized audio, I can have
a stab at it.

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