Hi,
Actually using a MIDI instrument will give you the best rendering. If you're not a keyboard player, you can still use a MIDI keyboard to get your part much more accurately than trying to use any audio-to-MIDI software. I'm no keyboard player, either, but I use this method quite often
Using your MIDI keyboard and Notation Composer, you can record just the rhythms into Composer. This may take a try or two - at least it did for me initially - because we're typically used to hearing proper pitches and rhythms. Start Composer to record (having the metronome "on" will make this method much easier to use), and then - using just a single note - play in the rhythm of the piece.
When you're done, it's quite easy to go back and fix the pitches in the recording in Composer. Just click on the first one, hum or sing the note pitch, and adjust the pitch of the note in Composer to match.
I find using the keyboard shortcuts to be a time-saver here.
(1) click on the note to highlight it
(2) hold the "P" key, and use the Up or Down arrow keys to move the note pitch up or down.
(3) let go the "P" key, and use the Right arrow key to move the selection to the next note
(4) repeat step 2 to adjust the pitch of that note, then right-arrow-key over to the next note, and just keep going.
As long as a note is highlighted, you can use the Right/Left arrow keys to move the selection of the notes to the left or right, and the note pitch will sound when it is selected. This is sort of a "scrub" type function, although it only works on a single staff at a time. Using this, you can check to make sure that the pitches for the notes flow properly.
I've put together a Tutorial video that shows this process, and a few tips, at
http://www.notation.com/Tutorial%20V...ardPlayer.html
This particular method is a lot faster in the long run than trying to fix a file that has been generated from an audio-to-MIDI .mid file (at least in all the testing that I did.)
Enjoy
Sherry