I doubt it squeak...

To me, most of this seems to be a styling team issue, maybe voicing team, too. Once upon a time, Roland's voice and style creators were the best in the business. Heck, they pretty much INVENTED GM/GS, which, for all the abuse it gets, is really a way of saying 'here are the main patches everybody uses, and drumkit layouts' and providing those in a consistent package.

This is where everyone has failed, lately joined by Roland themselves. Consistency. The products voiced around the Sound Canvas engines used to be that way. Once upon a time, it didn't matter which Roland E.Piano you selected, they were the same volume (if you didn't move the volume command). They sat in the mix roughly in the same place. Same with basses, strings, horns, you name it. EQ was consistent, if you took a style with a rock kit, and changed it to a jazz kit, it still worked.

Same with the styles. Roland styles were consistent. You changed styles in the middle of a song (I love doing that between different styles of the same genre, to add variety to a piece) and the volume didn't jump, the EQ balance didn't jump, it sounded usually pretty natural.

Now, sadly, a thing of the past. Change pianos, and you find yourself having to move the volume slider to compensate. Change styles, and sometimes quite different instrument balances, overall volumes and EQ balances change. It's as if, back in the Sound Canvas days (and a few products afterwards, like this E-09), there was ONE guy who did everything... or at least rode shotgun, and banged everything consistent before it was made public. Now it sounds more like a whole bunch of different guys doing their thing, with no one person making sure they all balance.

Cutting corners has NOT helped, I think...