Please Let me adjust my notification volume or change it

I just would like to be able to increase the noise made when invited to a game. I constantly miss games with friends because when we take breaks and come back ill be on another screen and miss the invites. Or someone will have gotten online I wont notice and miss an invite due to a dainty noise. Use some of those awesome log in screen noises or let us buy some.... I sometimes don't play because I miss an invite and don't want to wait 40 minutes so ill play another game. (I'd really like to have as my notification but 1 step at a time)