How can I customize my LG G2 text notifications in Hangouts?

[AC Question]

I've already changed the notifications noise the following areas:

- (general settings) Settings > Sound > Notification sound
- (hangouts) Settings > User > Hangout Notifications > Hangouts messages & invites
- (hangouts) Settings > SMS > Notifications > Sound

and yet, I'm still getting the default notification noise about 80% of the time. Do you know what other area of the phone I haven't covered yet, and will be able to change my text alert?