When using my Roland piano through a UR22 midi into Cubase 8 with The Grand 3 selected, I get a swishing noise every time i press the sustain pedal - sound like the strings being released on a traditional piano. This noise actually records and is represented by a vertical line on the track. I have asked Steinberg and Roland to comment but no joy yet.
Just found a setting in The Grand 3 which allows me to turn the damper pedal off and this seems to have solved the problem. Obviously there for a more ‘authentic sound’ but sounds like electrical interference.