Clay,
Yes, the sound was created with Sibelius and the Noteperformer 3 plug-in. The more I work with it, the more I sense that version 3 of Noteperformer works better in many subtle ways.
Actually there is a complication to this: I actually create the scores using Musescore, which has become quite a bit better over the years, although perhaps not up to the level of Finale and the other score creation software out there. Somehow I can't bring myself to learn Sibelius enough to use it to create scores...it just seems hard to use. After creating a score with Musescore, I export it to Sibelius using the MusicXml format, then render the sound there.
Reha, thanks for listening. I'm quite happy how the Minuet movement is turning out. There is a second movement to this little symphony, but I'm hesitant to introduce it quite yet.
Jay