Band In A Box will convert a monophonic vocal to midi. Is this what you are after?
The routine is called "Audio Transcribe (monophonic)" and it's found under the "Audio" menu.

Simply open (or record) the vocal line so that it is on the Audio track. Once the vocal is present, then it's possible to create a midi file from it by selecting the above option. If you have BIAB for Windows, you will also have Realband, and Realband can also do this.


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Audiophile BIAB 2025