Inkstrumental is the latest iPhone/iPod Touch app from the London's ustwo creative studio. A collaboration between ustwo and artist Jon Burgerman, Inkstrumental allows you to create simple musical tracks and share them over youtube. As the name suggests, the app is about attributing sound to drawings, ie ink. Jon Burgerman has illustrated 31 characters, each one attributed a sound or sample. You first browse the characters where clicking on them will produce a sound, then filling the "library" slots with the ones you'd like to use in your track (8 max). You can change the backing track by selecting a new one from the scenes. Some characters also change their sounds depending on the level selected. Then you enter the score with the loop where you tap on the characters when you want them saved to the loop.