How to reduce Notification tones volume?!

[myname70]

It still NO WAY to change the Notification tones volume... very disappointing .. such basic function no to be amiable in iPhone products..

 

[dcharleyultra]

Go into the iMessage app, and then use the Volume Down button on the side of the phone.

 

[myname70]

Go into the iMessage app, and then use the Volume Down button on the side of the phone.

Shall I uncheck the Change with Buttons? And if I want to reduce the volume of Hangouts tones, for example, shall I go to the app and use the volume key?