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Tutorials » Audio

Layering Audio in Flash - The killersound Technique™
Author: killersound, Inc. | Website: www.killersound.com |

Step 6

You should have an idea of how you wish to score the music. For example, you can begin by playing the "electronic" sound only or simply start all of the sounds playing together. There are many ways you can arrange the music to your liking. It is important to note that once you start the sounds looping, you are limited to 8 envelope points in Flash until they stop. The envelope points, which appear as little squares in the sound window, are "volume" points. You can click and drag those points to create volume effects. It is very important to note that setting the volume levels to maximum on every sound layer may result in distortion. This result is due to the fact that each sound is optimized by itself for maximum volume. To remedy this you should balance out the volume levels in all layers; that is, you should adjust the volume levels appropriately in each sound layer in order to get the right mix of volume. The two windows within the sound window represent the right and left channels. You will want to make sure that you mirror your actions in both windows, unless you wish to create some effect such as panning.

If you use the "event" option for synching, the sound(s) will have to download first before starting to play. It is important to keep in mind that when using "event" Flash exports and reads each sound layer separately. The advantage to this method is that Flash treats the sound files as instances. Once all the individual components or sound files are loaded, they are treated similarly as graphics. So regardless of how many times you loop each sound file in its own layer, Flash does not take extra file space to loop the sound files over the timeline and does not tie the sound layers to the animation that is taking place. The sound files run separately and independently of the graphics when using the "event" setting. Occasionally we have encountered issues with computers that have slow processors. If memory is lacking, Flash will not be able to read all the layers in the same frame at the same time. This may result in the sound layers being out of sync with each other. To remedy this problem, VR Professionals www.vrprofessionals.com came up with a way to kick off the Flash Player into "stream" mode at the beginning of the music, just long enough to get the "event" sounds going. In this case, you can see in Diagram 1 that we used a very small sound called "null" and started that sound right before all the other layered sounds. This particular sound is set to "stream" and is the only sound set to "stream". It is also looped just enough to overlap with the other layered sounds. This "null" sound can be any short sound; ideally it should be super small and silent. You can download this file from the killersound site www.killersound.com.

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