Thanks for clearing your target, that makes it so much easier.
To get the time line window equipped with an audio file representation do the following:
Add an object, e.g., a Null.
If this object is not in the Timeline window, drag it in.
In the TL-Menu>Create>Add Special Tracks>Sound
Then have a look into the Attribute Manager, to load a sound file in that fits to the requirements. Since R13 more formats are possible.
You might check the Time Offset.
If you don’t see the wave-representation, click on the little triangle near the Sound track, that will open it.
I have good results with setting “Markers” to my “key-points” or Beats, to get the animation easier into sync.
All the best