gryphon++++++

Does anyone know how to take a WAV file and convert it into MIDI?

Not without software similar to voice recognition. WAV contains the raw waves encoded in digital form. MIDI takes a given instrument and plays it for a given note, volume, and duration. To convert WAV -> MIDI, you need to split apart which parts of the wave form go with a given instrument (which could get pretty deep into wave theory), then choose a corresponding MIDI instrument. Very non-trvial.

Update: Actually, if your aim is to take a simple MIDI, transfer it over shortwave into a WAV, and then decode on the other end, your task is much easier. You just need to match a single instrument to a predetermined section of the WAV. You'll have to account for noise, but that's easier than a generalized WAV -> MIDI transformation described above.