That's a foot tapper. Well done!
I tried out Garageband, and, well, this is the result...
https://soundcloud.com/j-ham-jhxc/stratosphere
I simply remade the "Spring of 2100" and renamed it "Stratosphere," gave it a cool, self-made image, and uploaded it to Soundcloud... my first upload on that site.
Took forever to find my thread this time... I waited too long.
onlinesequencer.net/269779
This is sort of a build on my contest entry that I called "Sharp Blob."