konradh
Although I think Melodyne is excellent for its core functions, I have not gotten very good results with the audio to MIDI function.

I've had mixed results both from the monophonic conversion and the polyphonic conversion in Editor. You have to do some work within Melodyne before dragging the clip across. The polyphonic algorithm has problems separating notes an octave apart (it sometimes reads the higher note as an overtone and you have to manually turn it on) and I've found the monophonic algorithm has problems with fast notes (I tried some cleanly picked 16th notes on guitar and found that it had tied a lot of them). But after the cleanup I've had some pretty decent results from converting finger picked guitar chords to MIDI. The main problem IMO is the velocities you end up with - I have to do a lot of velocity editing in the PRV. 

I do not have a sample to try this with, but am curious what happens if you simply drag an audio drum track onto a MIDI track like in this thread http://forum.cakewalk.com/FindPost/2908365
 
Does it even come close? 

Yikes... I see what you mean now. All the bass drum! At least the velocities are different.
 
I took a groove clip and offloaded it as a wave (no effects), then imported it back into an audio track to use Melodyne on it (polyphonic). I then exported it as midi and pulled it back into SONAR, and it was pretty accurate; BUT the midi notes being hit were not correct, so had to move the midi rows to the proper midi note. Even with a clean beat sequence this was more labor intensive than I would be willing to do for an entire song :( And this was *only* a drum track of 6 bars.