Hello Paul,
Just to inform you that I have also the same issue as Kevin, I have with the last Vienna Synchron Pianos far more crackles than I was before, some random peak.
My config is pretty good (Windows 10 - I9-9900k with RME Fireface UCX and SSD Drive), sometimes I have a random peak to 100%. I have also tried to decrease my buffer from 48 samples (it was ok before) to 256 samples: it doesn't seem to solve the random peak issue.
I'm testing with Steinway D Concert Sur to Stereo preset, and Yamaha Concert Sur to Stereo preset, it's exactly the same issue.
Regards