Not Enough
This app is just ok. There are very few sounds and they are controlled by separate volume sliders that never stay where I want them and don't go loud enough. The paid version has a total of 18 sounds, six in each category. You can only mix sounds between different categories, of which there are only three. The variations in sounds consist mostly of different volumes, except for seagulls or thunder on some of them. Not horrible, but it does need further development.