Finally. ST3 and MP2 is working in Notion.
Go download the latest ST 3.6.4 and/MP2 2.0.2. I have tested both of them in Notion and samples will load and play.
Sonar Platinum. Win7 64bit. i7 CPU 4770. 14 Gig RAM. Roland A500Pro controller keyboard. Korg Krome 88. M-audio Audiophile 2496 soundcard, Focusrite 18i8, Roland UA25EX. Ivory II, True Piano, Addictive Keys, Synthmaster, Harmor, Zeta +2, Lounge Lizard 4, Geist, Miroslav 2, Sample Tank 3. Kaiser grand piano. Shure KSM137 x2. Wave's Renaissance and Gold. Breeze. ST3. Pianoteq 5. AD2.Aether Reverb, Dune2 , Reason 10 and Komplete 10 Ultimate, Syntronik, O8N2 adv, Studio one 3.5 Pro.
https://etherealpiano.bandcamp.com/