How does black on black sound different from the black and white version?

Doubt it ... But if you are playing in the key of C at least you could say you were playing black notes ...

I like that look. The Roland Keytar has black on black too - very cool

Looks cool but I wonder if would throw off your playing a bit if you just glance at the keyboard as you move your hand to a new position.?

Thought about that too, but I try hard not to look at my keys and go by feel alone. Playing as much as I do, it's coming along fine.

Actually, nobody can prove that it doesn't. The physical wave is probably the same, but sound is merely what the brain interprets based on the signals coming from the ear drum. As perception is always subjective, and brains mix auditory and visual perception, who knows if the end result is different or not...

Never mind, that was the Zen Buddhistic answer

I'm sorry but NO WAY! I would like to get the new software package Sweetwater provides.