Streaming Audio and Video
separate play/pause buttons for music and media on the Top (menu) Bar
hovering over the media play button will bring this menu up where you can choose to click on the sprocket/gear icon to access the audio and sound preferences.
There are several volume sliders available here so you can customize the levels for each, note that the master volume slider affects ALL volume.
You can enable/disable Streaming music, Media and Voice Chat from the the check-boxes to the right of their respective volume sliders:
Allow Media to Auto-Play: with this enabled media will play automatically (not recommended).
Allow resident scripts to play media: will allows scripts to automatically start media (not recommended)
Play media attached to other avatars: enables media attached to other avatars
Enable media filter: (increased security) this will let you control what media stream you connect to, allowing you to whitelist or blacklist any media stream.