Good question Bacchus, as a newcomer here, I was hoping to see more responses, or advice!
My impression, as a beginner on SX900 keyboard, is that the "Normal" velocity seems about right. "Soft" seems too soft to me, and "Hard" seems too hard (!) at least as I am just starting out. Perhaps with more experience, the other velocities will seem better suited? What is your experience?
One other thing that I think is related to velocity, is "Keyboard fingering mode". Again, as a beginner, I'm not really sure which is the best way to use this. I keep alternating between "AI Fingered" and "Fingered on Bass", and haven't decided which one to stick with! Any opinions on that?
Thanks! Jerry