You animate the scale of the elements.
Is there any tutorials for that?
Trapcode sound keys is what you need.
You can use Convert Audio to Keyframes from the Keyframe Assistant then tie the keyframes to scale using an expression. Just typing audio to keyframes in the Search Help field in AE will point you to a bunch of info: http://www.adobe.com/cfusion/search/index.cfm?cat=support&term=audio%20to%20keyframes&loc= en_US&lr=en_US&product=aftereffects
Or you could just use Google. The process is fairly straight forward. For example say you have a shape layer in the form of a square and you want to make it bulge in time with the audio.
- Create your shape layer using the rounded rectangle tool
- Add your audio layer
- Select the audio layer and then select Convert Audio to Keyframes from the Keyframe assistant
- A new layer is created called Audio Amplitude
- Press the U key to reveal the keyframes in the Audio Amplitude layer
- Go to the shape layer and press the U key twice to reveal the layer's modified properties.
- Make sure that the Transform Rectangle 1 position value is 0, 0
- Go to Add and add pucker and bloat
- Adjust the roundness and the pucker and bloat values to get your starting shape
- Adjust the pucker and bloat amount to get your maximum and minimum distortion values and make a note - in my example the minimum value is 30 and the maximum value is 50
- Select the Audio Amplitude layer and select both channels then select the graph editor and observe the values
- Pick the minimum and maximum values you want to use to initiate the changes in the rectangle - for example in my audio clip the minimum value is 0 and the maximum value is about 19 (looking at value graph)
- Add this expression to the pucker and bloat amount
t = thisComp.layer("Audio Amplitude").effect("Both Channels")("Slider");
ease(t, 0, 19, 30, 60)
- Make adjustments to the expression to get the look you want
Trapped sound keys will do about the same thing but you'll have more control over the frequencies that you are sampling
You can use this for any property.
The expression first defines t as the value you are referring to as the keyframes for Both Channels, then sets the minimum and maximum value of t you expect to see. The last 2 numbers are the minimum and maximum values you want to generate. In this case if the audio amplitude is 0 then the amount is 30 and if the audio amplitude is 19 then the amount is 60 so the shape will distort smoothly from a maximum value of 60 and a minimum value of 30 as the audio plays.
Hope this helps. It's pretty basic stuff.
You'll end up with something like this:
The steps you gave me are a bit hard to follow.
Here are a few video tutorials about this topic: