Ian, I believe that is true..I have going through 100's of sounds, playing via midi from the G70 keybed..and the like named sounds are virtually identical sounding..
The classic piano was my favorite when I first played the E-60..no wonder ..it is nearly if not exactly like the grand X..[with a little filtering]..
I really would like to know if Roland is using the same sound chip[ or most of the same sounds without compression to reduce the wav size]..
Here is my suggestion to Roland..Add the mic input and audio ins..and maybe the vocalist too...even for another $500.. It puts the board in a "must have" price range..even at 64 polyphony..
Even without my suggestion..The E-60 is a winner..There is no competition in a 76 key arranger..