Tony, it has been my experience over the years that most of the Yamaha arranger keyboards sound damned good OOTB. Don Mason never touched the EQs more than a smidgeon and said they sounded best when left in the flat position. I tuned a little, but not much to get really great sounds out of the S-950.

I never got a reply from Michael Vonken about whether or not the keyboards he demoed were specially tuned for demoing, but my PR buddy at Yamaha said he didn't think that anyone touched them prior to the demos other than to learn the intricacies of the OS and features - that was about it.

I suspect that what you're hearing is OOTB - nothing more, nothing less.

All the best,

Gary