Windows 10. Finale 26.3. Out of all the samples I've heard on finale so far, I have to say most are very close to the real thing. The orchestral brass section instruments with the exception of the french horns all need more work. Also the range on the tuba is dismal. It starts at low E1 and goes up to Bflat4. That is a comfortable range for most decent high school tuba players. Professionals can go quite beyond this on both ends.