Wait a few seconds for Patatap to download then start to hit the keys on your keyboard to "create" a soundscape. Team it up with a screencasting option such as Screencast-o-matic and you can record your composition as a movie.
Silvia Rosenthal Tolisano has written this reflection on a recent presentation from Beth Holland focussing on the effective use of technology and iPads. She has embedded the slides Beth used, (which should be viewed),. She has also reflected on the message and explored the use of sketchnote to record the presentation