I called Yamaha tech support, no help. I called local Yamaha repair, no help but would evaluate problem for $50 but also said keyboard was too old for most parts.
Gary, you are a lifesaver. I have been performing with the S910 for 7 years and never realized (Duh!!) that the talk button overrides my registration settings. You Fixed the problem. Now I just have to re solder the loose PC board power and ext speaker jacks and I'll be good to go. (gotta quit droppin' the darn thing)
Thanks again