I Don't recall reading about this subject...I remember just a few years ago I purchased the first FantomX 76 Key Synth From Piano and Stuff in Pittsburgh, Pa...I was always kind of a Roland Guy owning the the XP-80 Synth before with the stock "Nice Piano" with the Lots of Reverb,etc. Then adding The "Session" Expanion Board to get The Stereo GrandPiano.

In the 88 Boards I had the Rolland A-90 EX controller with the Piano Exp Bd...Also the RD-150 Stage Piano along the way..(Very Warm,Jazzy)

My point is when I played the New FantomX The Ultimate Grand Piano was Completely Different sounding...It was beautiful but different!...I've known the Salesman(musician) for quite a while. He Told me 2 Possibilies of Piano's being used to sample...Both being rumors...Roland is very secretive!

Well...All those keyboards are Gone, But I have the Roland RD-300gx Stage Piano with The Beautiful Ultimate Grand X Piano My Wife plays...I always bring the high down a bit and the low up a bit on the eq to warm it to my taste.(It has the 3 EQ knobs on the Piano,nice)...

I have a E-60 Roland and a Tyros2 arranger as well...MAYBE some Interesting comments to come after hearing some others!

Have a Great Day ....Harold