Agreed - I don't have perfect pitch but as MOI and Steve have said, it's perception not memory, which can be two very different things. When I've interviewed players with perfect pitch what's struck me the most clearly is the fundamental perceptual nature of it i.e. when a keyboard is transposed the player does not like it at all, not because they 'remember' the pitch ascribed to that key on the keyboard, but because when they perceive both the visual (the key being pressed) and the auditory (the sound heard), there's a perceptual dissonance. I'm probably not grasping it anywhere near fully either...