This video shows how the TROPE App works on an iPhone 4 ... if you understand the intensions of Brian Eno and Peter Chilvers and find the trope of yor music.
I played \"Lichtenhain II\" (Lichtenhain is a a suburb of the town of Jena) without additional sounds. What you can hear is the original headphones output of the iPhone without any overdubs. I only added a slight echo effect from one of my two YAMAHA EMX 5000 mixer to create the azimuth coordination for my 4-KLANG quadround sound.