Yes it is very easy with Sonar Professional or Platinum and Melodyne installed. All you have to do is grab an audio track and move it to an empty MIDI track. The Melodyne Essentials that come free with Sonar only does monophonic tracks but if you upgrade Essentials to Editor or Studio 4 you can do polyphonic tracks.

I have had excellent results doing this. I have taken audio guitar tracks, strumming, picking single and double stops, and finger picking as well as piano tracks and converted them to MIDI with minimal of editing. I have also take RTs and converted them to MIDI. How much editing depends on the audio track and the track's effects. I have found it best to not have any effects on the track. This includes delays, reverb, compression, etc. If you have a lot of notes in the audio track it can be probmatic, however I have done some of JonD's piano parts played on my wife's 3/4 size upright with very little editing.

On the down side Melodyne Editor did not transcribe pitch bends. I have upgraded to Studio 4 but I have not had a chance to fully test it yet. It you think you're gonna take a CD and change it to MIDI forget about it, it ain't gonna work. But for a single instrument track it works fine. YMMV.

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64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware