And again, I reckon the eyes/ears thing is as Howard says, complementary rather than opposed. Having (to some extent) taught myself to pick up tunes on the fly while playing along, I sometimes find myself getting the sense of a tune and most of the notes, with a few bits I can't quite get straight in my understanding. And at that point, a quick look at the dots will probably show me what I'm not getting, quicker than going for the slow-down software. Which, again, is complementary to the other techniques ...

I wonder, does anyone have any info concerning the effect of ABC on book sales ? I'd like to think this is, again, complementary, but I don't know.