QtQuick 2.1 SoundEffect very low volume on iOS and Android (Qt 5.2.1)

Wav files played with SoundEffect

Wav files are played with very low volume, almost inaudible.
The error is on Android and iOS ( real devices )
Works fine on Windows and OSX.

Example:

SoundEffect

{ id: music source: "sounds/mysound.wav" volume: 1.0 }