Small issue. But I have sound effects turned on in settings. When I upvote something there is an audio tone. However, when I put my phone into silent mode via the switch on the side of the iPhone, I still get an audio tone when I upvote something.
I turned off sound effects for now, but I think the app audio settings should be overridden by the phone settings (silent mode in this instance).
Let me know if you need more info.
Thanks!