How to Layer a Sound Effect

With pictures there's a degree of layering but it's fairly clear cut, literally you're cutting between pictures. With the sound I think you can build up the layers. Filling anthems for example during six nations and whether you when you go to the anthem shots of the teams do you actually want to hear the call singing of the stadium or do you want to hear in all due respect the fairly poor singing of the individual players. That's an interesting mix that the sound guys have to deal with because you want the personality and clearly they know the words but often they're not sung very well. If you didn't hear their sounds at all then you'd feel a bit cheated.