Saxophone - 12 octaves?

[Juron Pilo]

Maby this is just ignorance on my part but the birdo npc says you can get 12 notes out of the saxophone... all I can get is 8(4 for the arrow keys and 4 more for 's' and the arrow keys) and a couple of tunes(one repeating one not). Both of the tunes are gotten with d and the arrow keys, specifically up and left. The other two keys don't react at all. Not even the saxophone animation. My question is: How do you get the other 4 octaves?

While I'm at it... I wish there was a way to make these npcs repeat instructions on how to use things without rebuying the item no? Like maby a "Help Sax" command or something