How can I manage and clear the App's storage?

If you need to free up some space on your phone or tablet, you can manage storage on your device from the Account Tab in Metronaut.

Scroll down to the Storage section. There you can choose to clear the following data: 

• Pieces: This means you will need to download the piece again next time you want to play it. You will need an Internet connection for this.
• Temporary Recordings: We store all recordings of your performances for a short time to let you decide wether you would like to keep them or not and then delete them so that you never run out of space.
• Saved Recordings: Those are the recordings you decided to keep. We won't delete them unless you choose to.

Note: If you are looking into managing storage in general on your iPhone or iPad, refer to this article from Apple.