A lot of organs have a voice register or choir register. These can be confused with a real human voice, at least for the duration of a note. The issue is that it is a lot of work to recreate all the possible sounds a human can sing. It is not just the 26 characters in the alphabet but you have different ways of pronouncing each character and then you have unique ways of switching from one sound to the next. So while we know how to make an organ sing like a choir it is too much work to make it sing more then one or two vocals. This is something that computers have only been able to do faithfully for about ten years, and are still not quite there.
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