How does PrE 9 fix audio levels automatically?

Hi,
In one of my projects, I'm combining multiple pieces of footage with different audio levels. I've read somewhere that PrE 9 fixes audio levels automatically. How do I use this? Where is this feature in the app?
Thanks,
Sam

The main thing I want is to make sure that audio level is too high for one footage and then too low on the other. At the end, all the clips are put together to produce a single video and I want the audio to be consistent throughout the video.
Would I then select all the clips and do what you're suggesting? Do I do this one clip at a time or do I select all at once -- not sure how to do it?
Thanks,
Sam

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