ok Leenia, ignore that particular video, or at least don't get tied up in it's specific scenario details.

Nobody as yet as I can find has uploaded a simpler demonstration tutorial
illustrating basic vocal pitch to midi conversion for realistically usable notation
with a Sonuus product.

.. and there is a slightly more expensive general purpose USB version of the pitch to midi converter
that is not marketed specifically only to guitarists.

I know from experience how well it works with electric guitars,
so I feel fairly well assured that with practiced careful use
it could be just as easy to convert clearly sung reasonably in tune vocal melodies.

With the practical option of manually tidying up individual notes afterwards
in your chosen sequencing software.

I am not the kind of person to be easily seduced by product marketing claims,
but in this instance I am inclined to accept that it may be genuinely achievable.