Scott Yee wrote:

"Considering the above statement, are there 'any' MONO sampled 'acoustic piano' voices included in the: Yamaha Tyros, 9000pro, PSR2100, or PSR3000 keyboards, or are ALL Yamaha acoustic piano sounds sampled in stereo only? If there are indeed MONO sampled acoustic pianos in the Tyros, please specify which these are."

Scott,

There is an easy way to diagnose if a Voice on the Tyros is Mono sampled or not. Under the Voice Effect column on the right side of the Tyros if you'll notice the Poly/Mono button and small radial light next to the button, if you choose a Voice on the Tyros that is Sampled in Mono the 'light' will "come on" telling you it is a Mono sampled Voice.

Unfortunately "none" of the Tyros' Pianos are Mono Sampled.

Best regards,
Mike