Converting audio level to MIDI?

I am programming a database application which should display several  
audio levels as a bargraph (one by one, not simultanesously). I can  
only process keyboard events (like if a user typed something). I  
heard that there is a program which converts MIDI to keyboard events  
which would be an option. Didn't try it yet because another question  
is still open: if I connect a mic to the Mac - how can I convert a  
volume level to MIDI data?

Any ideas? Maybe a cheap hardware?
No MaxMSP solution please unless it is already programmed.

Thanks in advance,
Peter Ostry




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