Okay, I'm using Adobe Flash CC. I imported a short (about 6 seconds) .mp3 file and I put it on a keyframe, but the "Sync" is stuck on "Event" and all of the other options (Start, Stop, and Stream) are grayed out so I can't click on them! Also the effects option is grayed out too. I want to set the sync to "Stream" because I'm doing a short animation with lip sinc, but it wont let me. 
It let me do it a few days ago, but very recently it just suddenly stopped showing the other Sync options. How do I fix it? Please Help! ;-; I can't find a fourm disscusing this anywhere!
Here is a screenshot: http://i.imgur.com/0fiI2gL.png?1