RC,
We are almost on the same track. With your new voices you certainly can get closer to the 50’s sound. But there is another view and it takes in the big picture – the keyboard as a single unit. The overall sound, although can be enhanced to sound a bit different, still favors a basic type of sound. All the styles and all the sounds produce a type of sound and in Yamaha’s case is it the sound of contemporary music. Yamaha has done this intentionally to stay with the market.

Opinion’s I have heard”
1-Yamaha has a great sound but it does sound like a CD. (Too perfect)
2-Korg has more of a live band sound. (Not as perfect but it’s live)
3-Roland is closer to Korg.
4-Technics is old but closer to perfect then the rest. (I put that in) (Smile)

John C.