Help: Whatsapp Ringtone!!!

May 2, 2016
How can I turn off the normal whatsapp ringtone WHILE I'M USING THE APP? I'm not talking about the typical sound of incoming/delivered message but I'm referring to the normal ringtone, which is working even if I'm using the app. If I put the phone in silent mode, just with vibration, each incoming message it vibrate!!!
Thanks guys ;)