This is a pack of all sound files from Knytt.
Here it is.
In Looki's extraction pack, all songs and ambiance were renamed to "SongN" and "AmbiN", and he didn't extract the sound effects.
This time, I kept the original filenames, so you can finally see the artist and title, and I also extracted the sound effects.
When you don't need to edit or mix the sound effects, you can use
this ogg pack (songs and ambiance not included)