Thanks to Tom's help I now have Finale 2010 using ARIA and GPO4. I was surprised to fund that I could use ARIA GPO and other issues of GPO in the same piece of music with no problem - I definately want the world sounds from Finale 2010. I found, for example, that the choir in GPO 2010 is far more pleasing to the ear than the choir in ARIA GPO. Also some instruments in GPO4 have too much of an edge to them; but I'll probably get that under control as my experience grows. I know, settings, settings, settings...

And the new ARIA look is quite nice.

Anyway, now to get the Mass in Eb on disk and off to potential buyers.