This app can generate many different sounds. The frequencies that are generated depend on the values you enter in the frequency fields. Each value has two decimal points. You can play all these sounds through headphones. These sounds will relax and calm down the mind. It is like an effective form of meditation, it's not a game. You can control the volume of each sound. You can choose the frequency of each sound that you want. If you want to save a preset, just select the name and click the save button. If you want to delete a preset, you can click the delete button.