I am positive the opening piano is "The Grand X"....the best piano on the G70 ... it is taking from the Fantom... It is 4 layer velocity switched as the SRX piano you mentioned..
Yep, you're correct, I didn't think of the fact that actually the Fantom X Ultimate Piano is also stereo 88-note sampled with four layers so it also has 704 individual samples. So about the time when the SRX 11 came out, the Fantom X's Ultimate Piano was released with a similar quality level.
I agree, I like that piano very much, too, its samples captured quite a lot of ambiance from the resonance of the original piano.
The SonicCell, which was recently discussed in another thread, has the Ultimate Piano from the Fantom too, but unfortunately a bit cut down with only three layers and audibly not all 88 notes sampled individually. And the Integra does NOT have it unless you use the special HQ GM expansion that needs all four virtual slots at once.
I never understood why Roland didn't continue putting the full-quality Fantom X Ultimate Piano into all of the newer instruments...
Certainly an excellent piano, especially for an arranger in 2004, leaving a Tyros piano sound of that time far behind in realism.