How to change WhatsApp notification & SMS tone for iOS 7? Does anyone know how to change WhatsApp notification &amp; SMS tone for iOS 7 (on iPhone 5S)?

I would like to use a ringtone such as Chinese music uploaded from phone or apps instead of using the default tone for WhatsApp.
This feature has been added and can be found in Whatsapp -> Settings -> Notifications. SMS tone is in the same place as always, Settings -> Sounds -> Text tone.