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MIDI and audio are not the same
thing. MIDI is a performance information while audio
is sound information. Lets look at the difference.
Picture a concert pianist performing
on a Steinway concert grand piano. Now what would
happen if the same pianist played the same piece
on a small upright piano that has not been tuned
since 1947. Although the performance would basically
be the same, the sound you hear would be very different.
Now picture the same performance on a harpsichord.
Or on a Pipe Organ.
Midi is the performance aspect
of the sound you hear. MIDI doesn't know anything
about the synthesizer that is hooked up to it (or
even if there is a synthesizer hooked up to it)
or about how that instrument is going to sound.
So no, you can not simply have
software "listen" to a song and have it
turn it into MIDI information. While some programs
that can translate monophonic parts into MIDI information,
nothing can yet listen to a complex piece of music.
A few years back there was some experiments in using
some very powerful supercomputers to translate two
part harmony into MIDI, but since that is a little
cost prohibitive for most people, learning to transribe
is still the best way.
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