Hello! I am hosting a mapping competition at bouncyball's group page.
Please check it out if you haven't yet and feel free to enter!
http://steamproxy.net/groups/bouncyball#announcements/detail/573480383277179941

In case you need to treat your sound files as music, add "#" before the filename in the ambient_generic entity. This should allow players to control the volume from game menu.
Example: "#sounds/intromusic1.mp3"