I too would find the sort of annoying vocalizer glitch (delay) Uncle Dave describes unacceptable, as on both Tyros 2 and Tyros 4, I've got no problem cleanly activating/deactivating the VH on/off right at the moment I activate the foot pedal.

I don't know if this makes a difference or not on the S910, but on Tyros 4, when the Vocal Harmony 'pedal polarity' is set to "-", VH is activated/deactivated when the pedal is initially pressed, and when set to "+", VH is activated/deactivated only when the pedal is released. I got mine set to "-".

Ok, back to that S910 glitch. I honestly would have expected the S900 series to be able to work the same way it does on the Tyros, and if not, I would think it a bug that Yamaha could correct in an OS update, as it sounds like a software issue. That said, how many S910 owners have actually contacted Yamaha to report this, and if so what's been their response?