Confusing

What are the numbers for? What is modifier modifying? How do you get rain sounds? Why can you drag mute from the bottom bar? Does it actually mute things? What are the balls for? How do i so this...? :( the sounds are nice, there just not the ones i meant to hear...

High oxide about eDrops Nature : Relaxing Sounds & Relax Melodies Maker, v1.8.2