Thank you so much! I really appreciate your thoughtful comments.
There's no big secret for the trill. The orchestral library I used (BBCSCO Core) has different "articulations" for each instrument. Wind instruments have "trill" as one of the articulations. Here's a screenshot:
I had not heard of André Rieu, but I noticed he has performed waltzes from several famous composers, including Shostakovich, from whom I borrowed a lot of ideas. I believe that's what you're hearing.
Thanks again!
