How to mute or reduce the volume of IMA ads?

Question

For some days I've been working on google's IMA (or DFP).

Now I need to know how to mute them even when it is loaded. I searched for that. Can't find a proper solution.

Note:

I didn't use any video player. Because I am adding it before a game loads.

Answer 1

You should use setVolume right after you started your adsmanager instance (see here for details) :

adsmanager.start();
//0 to mute, 1 to unmute
adsManager.setVolume(0);