Stradivarius Cello. Double notes are not working for C#3+G2, C#3+A2, C#3+B2, C#3+C3. All other double notes work, even the less likely and impossible-to-use ones, such as C1+Bb4.
Kontakt 8 Version - 8.1.0 Stradivarius Cello Version - 1.3.0
