Shouldn't matter if a user is messaging from a separate tab or device...

under the same user name, chat history should always broadcast.
Also, I'd change line 112 to the following:

```coffeescript
if not local and !belongsToCurrentUser and (@getActiveChannelId() == activityAttributes.channel_id) and activityAttributes.action == "message" and Kandan.Helpers.Utils.browserTabFocused != true
```

(note the !belongsToCurrentUser). This way, a sound won't be created across all his devices logged into Kandan