If your goal is to "convert" the audio into notes you can edit (like a piano), use the tool:
can help separate vocals from a beat if you are trying to "reverse-engineer" a track for your project. Stem Exporting
A professional remix project file made in minutes.
You cannot "un-bake" a cake back into its original separate ingredients (flour, eggs, sugar) just by changing the file extension. Beware of Fake Online Converters