Yes, click publish then click the general tab and there you can load a background sound file and check it to loop. You can also have another sound over the background sound. Click on a scene and then in the properties section you can add a sound just for that scene. This is if you want to add a voice over to a scene. You can add sounds such as running water or outdoor sounds of birds or the ocean. I use these sounds for my outdoor scenes.
Nikon D300, D3s, Nikon 10.5 lens, RingT105N+Footplate+MrotatorTCPs, Giottos MT9261 Tripod, Manfrotto 410 Jr geared head.
If you know the "secret" then everyday is a good day!