With more than one person in the office having multiple Windows 10 Mobile devices on their desk, it can get confusing which phone is sounding off a notification. Enough is enough, so I decided to finally change the default notification sounds. This is also helpful If you're tired of hearing the same notification sounds on your Lumia 950 or 950 XL. You can customize the sound per app. It's not very obvious in the Settings, so I'll show you how to do it.
Full story from the WindowsCentral blog...