I am in my 3rd week with my w8 phone, and after downloading some xbox games, most of my sounds are now muted. My morning alarms still sounds off, but all of my caller ringtones, game sounds and other alert sounds are quiet. I still get vibrations, but no sounds. Where do I find the setting(s) for this? I can't even listen to ringtones, they play, I see the progress bar moving, but no sound.
It may sound silly, but have you double checked Applications > Settings > ringtones sounds to make sure the Ringer is enabled by sliding the switch on and All Other Notifications is checked? Since your morning alarm still sounds, that helps me to know your speaker is still working. When you're listening for your ringtones or game sounds, do you have any type of Bluetooth in range of your phone being used? Or maybe any other hands-free headsets attached? Also, try rebooting your phone http://bit.ly/ZtGhKD to help clear any little quirks you may come across.