How can I make different layers of audio play based on items picked up?

omg thats perfect thank you!

There is also one other thing I was looking for which you might be able to help me with?

I have an enemy in the level which chases you and I want it to get faster with each pick up (kind of like slender), can you do this in a similar way?

This is for my university project so I really appreciate the help <3