Actually I haven't paid attention to that, sorry.What about when you pull down the Notification Center? I loved the little sound it made in iOS 10.0-10.1.1, but it's gone in 10.2. How do I get it back?
But I assume the workaround is similar to the scrolling wheel sound: tied to the keyboard sounds option, so it won't be possible to turn on.
EDIT: I tried by myself and there's NO sound even with keyboard sounds active.