Years ago i saw a guy put notes/chords on a stave with just the mouse—and play back like a bizarre classical funk ???
That’s a lot of freedom with intervals your singing voice might guess at…that is to say you “play the picture” of it…and polyphony you might be thinking about but can’t quite hear, or sing ???
But to your point: How do you do that?
…convert audio to MIDI? What are the steps in brief ?..if you follow the theory ??
If you have the full version of Cubase, Variaudio comes with it which can do audio to midi for monophonic material. The details I do not know because I have Cubase Artist, but it should be covered in the manual. How well this works depends on the quality of the recording and on the timing of the material.
Midi to score is instant
I was kidding around with Papi61 regarding it being too accurate.
The way Cubase deals with translating midi data into Score (sheet music) data is not liked by all. If you play something in on a midi keyboard, or use the Audio to Midi function you will have to massage the Score to make it look good. And there is a learning curve. But you can get really good results. I do lead sheets and charts for small ensembles.
You really should download the Cubase trial version, you get the manual and the full program and you can play with it for a month. That will help you understand what it does exactly.