I'm using CM13 (13.0-20160716-UNOFFICIAL-i9082) for my Samsung Galaxy grand(gt-19082)
I have flashed it several times. But a few days (it worked fine for 2-3 days) after the above version was flashed, all of a sudden my media volume became too low. I have tried disabling and re-enabling my default music player. Still the problem persists.
No other volumes has been affected, and everything else is working just fine. I can merely hear the volume when i play a song in any of my music players (tried about 3 of them).
Everything(including media volume) is perfect over the earphones.
Edit: The volume works fine in MX player, provided the HW+ (Hardware acceleration) is enabled.