According to those traditions which prohibit music during the Three Weeks and parts of Sefirah, but permit a capella, would listening to computer-generated vocals be permissible during Sefirah? Is the custom to permit vocals, however that’s defined, and would include anything which sounds like vocals? Or is there something unique about actual vocals which wouldn't extend to computer-generated?
I'd assume that computer-generated vocals couldn't be any worse than a recording of human vocals, regarding which many are lenient, but perhaps there's a distinction between something which was at some point an actual human voice and something which was never a human voice (though I can't imagine why).
Yes, this question extends to any other such situation of an instrument which sounds like a human. I only ask in this type of situation because in my experience it’s the most common such example.