If you are looking for something that “sings” you might look at Virtual Singer, from http://www.myriad-online.com/en/products/virtualsinger.htm

With some heavy duty tweaking, it can sound almost real. Out of the box, not so much.

There are many companies who make choir libraries. But there's really no "one size fits all" solution. Many libraries go for the epic sound that you'd hear in a film trailer. Others sound more like a church choir.

Here's a link to a discussion about choirs on another forum.

https://vi-control.net/community/threads/choir-library-on-a-budget.72980/

But all of the choirs were developed to be used in a DAW, using it in Finale may create new challenges.

Some of the companies that make these libraries are East West, Soundiron, 8dio, Strezov, Fluffy Audio and many others.

Good luck!

Hi Guys, many thanks for all your help,I am sure that I will find something that will work for me,and,at least,,will, be 

better than Arias current.Perhaps they should be looking to improve the vocal/chorale options,although I presume that

Garritan could also be involved.In conclusion I am happy to consider this issue resolved.

KInd regards

Eric Johnston