I've been researching this , and so far there seems to be the finale and sibleus packages ( finale print music requires an upgrade cost to get the full scanning package ...) There are lots of lesser known companies that offer something like this , but I've never heard of them.
I have several melodic theory books that didn't come with a CD and I would really like to be able to scan the staff from them and put the midi into a GM synth so I can add the audio component as I read about the theory ....
Any tips or input is greatly appreciated !!!!!