(Studio One 4 Professional, Kontakt 6, Windows 10 Home, all up to date.)
I'm using Evolution Steel Strings, an acoustic-guitar library by Orange Tree Samples. I created a MIDI part that plays fine when the song's tempo is between 85 and 120 bpm. When the tempo is higher than 120 or lower than 85, though, the part becomes choppy, with missed notes and late chords.
If the part went wrong only at higher tempos I would figure it's a CPU/memory problem. The fact that it happens at lower tempos too has me baffled. Suggestions appreciated. Thanks.