The simplest way to use it is to just draw something, click Play, and listen. But there's more than that! If you press the "i" key when you are moused over a filled square, it will change the color of it. In Soundscape, colors match to instruments, so move the sliders at the bottom to change them. You can also press "Clear" to start a new song. Another way to use Soundscape is to press the Loop button, and change your drawing in real time! Have fun making music!
