Modifying the ios{ ... } block in the .pro file removed the prior errors.
I also added those lines into the code of main.cpp, and installed the project via Qt Creator on the phone, but no voice yet!
That is, neither sound.play(); nor onClicked: playExplosion.play() plays the audio file on the phone. :(
@jars121 Could you put a sample code on how to get this effect using OpacistyMask and ConicalGradient? I am trying to implement this effect but with a poor result..