I like the jingles, though I wouldn't necessarily mind the ability to have separate settings for when launching from the editor, as the failure jingle can get a little irritating when testing an in-progress level. Still, it can be a useful notification for if I'm testing a level, as the failure jingle can serve as a notification that, "Hey, you didn't actually hit the save requirement there - something's either wrong with your attempt or the level settings!" in case I wasn't paying attention to the results screen. If the options were available, I'd at least consider disabling the failure jingle but not the success jingle when launching from the editor specifically - though it could easily end up being one of those options Simon talked about a while back where you really want the option, but then once the option exists, suddenly you're okay with it the way it is.
If we're going to allow custom jingles per pack, I suggest following back to the defaults if the user has not installed the music pack.