One of my issues is that I am a member of several teams all with their own spaces that get inundated with messages all day. Some of these spaces are more important to me than others where I am expected to keep up with them regularly. Also, some messages are more chat type real time messages. The problem is that all of these use the same notification sound. Sure, I can turn messages on or off per space, but they all use the same sound. I would like the ability to customize the notification sound I get on a per space basis and even use custom sounds. It would also be nice to have a different sound if the communication is one on one like in the context of an IM.