Hi Phillippe,
Unfortunately I don't own for now the Olympus choir...but I was seriously intrigued by their aproach. I watched almost all videos and instructional demos and looked intersting; but again, not so easy to use , and also a bit cumbersome having only some words that you have to combine in order to get others...the result could be awsome if you spend some time...fact true for other choirs.
The sugestion that I wanted to be aware of, in my previous post, was related to the fact that I observed along with your midi mock up that you are a person with sensibility and pretious atention to detail...and with choirs ...this is very frustrating. However, if you' re willing to spend some time and take advantage of all tricks and tweaks available from the manufacturer or other users, you will find that any of the choirs in the end do the trick. Just that is such a large pallete and each and every choir is lacking different things - in a way, they complement each other, but none of them has all the features incorporated into one single product.
Again, I was really amazed about your strings in your Mozart's Requiem mock up.. they are so full of life - trully impresive !!
Looking forward for more ,
B