He encontrado este hilo en XDA y parece que asi se soluciona... Tendre que probar
http://forum.xda-developers.com/z3/h...t2891719/page2
This worked for me but for right now am i having difficulties repeating the success.
1. Go to settings - sound - system notification sound: select no sound. Do the same with whatsapp settings.
2. Install lightflow. Go to lightflow notification settings, set an mp3 file other than the ones found preinstalled in your phone as individual notification sounds for whatsapp, whatsapp groups, gmail, messages etc.
3. Go to lightflow volume settings, activate individual lightflow notification sounds and adjust their volume to the max ( louder than phone ringing tones ).
I am using "nextel" sound that i downloaded from zedge ages ago. It now plays as loud as in my previoud phone LG G2. I am using it with whatsapp and am very happy.
I did try to replicate this procedure and cut a small piece of a moby song and set it as gmail notification sound. Not as loud as my whatsapp sound. The piece that i cut from the song wasn´t so loud to begin with. I´ll try again with a louder piece of song or a new zedge - tune when i have time.