You can manage your QQ International sound alerts and modifications through the Settings menu.
QQ International for iOS and Android
Tap on the “Settings” tab in the lower navigation bar and then touch “Notifications” as below:
You can then access the following options:
QQ International for Windows
On Windows you simply need to enter the Settings menu from the bottom part of the Main Panel:
Select Sounds from the General tab and then change as you please the files played with each kind of notification.
You can customize each individual sound alert by turning it On or Off, or upload your own .wav sound clip.