Just wrote this article for our site SweetJusticeSound.com, I hope you enjoy!
http://sweetjusticesound.com/2014/07/06 ... nd-design/
User experience is heavily influenced by sonic identity – the crunch of the crisp (or chip to our American colleagues), the crack of opening a tinned beverage, the weight of a car door slam. All of these are audible signatures that the general population are not only accustomed to – it is something that is expected. Imagine taking away the sound from any one of those examples, the expectation will have not been met and the end user will most likely experience dissatisfaction.