Hmm... I just tried using Kontakt as a VST instead of Notion's inbuilt piano and it works perfectly with very low latency and no timing glitches. So the problem has to be with Notion's own sound engine, by the looks of it. Since I have a zillion VSTs, I guess I can use these instead of Notion's soun...

Hardware: Acer V5 laptop, 8G RAM, 1T HDD, Windows 7 SP1 64 bit, Core-i7 Audio interface: Scarlett 6i6, running latest driver and firmware updates. I am new to Notion, having picked up a copy recently on sale. I am having a bunch of issues and wondered if anyone else is experiencing anything similar....