Hi,
What I did is adding a delay at the beginning of the level and play the sound cues and visuals through the sequencer (I think they added this possibility a bit after my original post - you add the actor to the sequencer, to which you can attach a sound cue if I remember correctly).
It is still going out of sync sometimes during the level - in that case I have to pause the game and resume (to stop and resume the sequencer) to sync it again. A pretty bad workaround but it can help