I observed the Renoise 1.5 presentation image on the index home page.
Although new analyzer is more precise than that old (there are Hz numbers), I prefer the graphic interface of Renoise 1.281 analyzer spectrum: old analyzer seems real group LEDs bars, whereas new analyzer seems drawed by hands.
So, in my opinion, ideal analyzer spectrum has got the old customizable graphic-look, and has got the Hz numbers. Naturally, all customizable.
By the way: is Renoise 1.5 analyzer spectrum customizable? I think so, but I’d like to get a confirmation.