Well here is one other random sample who has to turn the inner voice on when necessary :)

Instead of a voice I have a constant song playing in my head when I am not focused. The song changes multiple times per week but if I am on idle I have a song.

When I speak the song turns off, but no voice comes on, unless I consciously prepare my words.

Now when typing this comment, I have a voice (which is my own voice) say the words I am about to type milliseconds before I type them.