How the remote audio is played in mobile version?

I developed web application using “lib-jitsi-meet.min.js” . In web I received video and audio track from TRACK_ADDED callback and I am able to play it reduce the volume of audio component i.

But I am not sure where the audio being played in mobile version as I am not using “lib-jitsi-meet” directly like web. I am just editing the available code in the git-hub for mobile version.

I tried writing a condition in mobile version TRACK ADDED callback which will breaks the function when audio track is received so that it will not add the track to the redux store or any middle ware. Even after that I can able to hear audio.

Can any one help me how to control the volume in mobile version. ( To control tracks )