Andrew,
The Expansion boards available each have hundreds of additional sounds not found on the G70. Even if there are a few already in the G70, there's just so many additional sounds found on each of the cards.
I am turning on the Fantom X6 as I write this post to give an opinion on the piano sounds stock from the factory.
George Kaye
Kaye's Music Scene
Reseda, California

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George Kaye
Kaye's Music Scene
Reseda, California