# Determining how loud an AudioClip is

I have some code that uses GetSpectrumData from an AudioSource playing a song to create a level layout for the player to play. I want to add a functionality where the players can upload their own songs and play the levels created with the data from these songs. Unfortunately, when comparing different audio files, I encountered this:

As you can see, the amplitude differs drastically from clip to clip, subsequently creating levels that are trivial to complete or almost impossible. I want to find a way to determine this "loudness" so I can tone it down or amplify it with a multiplier after getting the data from the song. Also, is there a way to extract this data without playing the song?