Hey! Yeah, audio files aren't included separately. But here, I made a Google Drive folder with some Creaker audio for you to use: https://drive.google.com/drive/folders/1RlcWPW26F3YGs8Z9uVyj5LN1KN4Gbd3R?usp=sha...
I don't have exact pitches, so unfortunately i can't tell you what the audio pitch scaling is or anything. You'll have to figure that out yourself or make a new scale.
Also, I don't remember the attribution, but it's from freesound.org.