Melodyne does exactly what I need but it is UI only. I'm looking for a way to shift formant of the voice programmatically. ffmpeg, sox, praat..? How can I do this?
In speech science and phonetics, a formant (phonetics term) is the spectral shaping that results from an acoustic resonance of the human vocal tract.
What kind of application are you looking for? Command line or python package.
What operating system do you want the application to run on? Linux
What budget do you have? 0
What features must the application have? The ability to change voice formant.