I've read a few questions about creating HUD / UI / interface sounds and a lot of them discuss using snippets of audio as a starting point. That makes sense from the standpoint of button presses, clicks, etc. But what about when making the more musical feedback sounds?
Just as one example, The Boom Library has a package called "The Interface" that does a bit of this. It's located here: http://soundcloud.com/boom-library/sets/the-interface/ (you have to click the actual link for some reason)
Sections 0:15 - 0:20 and 0:32 - 0:42 are what I'm particularly interested in. But I've no idea how to create that sort of thing or how they're doing it. Any ideas?