> Are you playing the most recent WP version (
1.0.0.5)?
Yes! 1.0.0.5
play on lumia 920 (windows phone 8.1)
Here's what I've found for you Lyubaretz.
"Among the many seemingly small but very useful changes in Windows Phone 8.1 is a rethinking of the ways in which you can interact with the various sounds that come out of your handset. Now, instead of a global volume control, Windows Phone 8.1 supports separate, custom volume settings for the ringer and notifications and for apps and media."
sourceThe rest of that source article explains how 8.1 allows you to set the volume on different sounds that come out of your device. Hopefully you'll find a solution to your problem there. Good luck, and if you find an answer please write back so we can highlight the solution for other 8.1 users!
Thanks,
~A