One of the ways Stockhausen put this piece together with the huge crescendos that go to a climax and then suddenly disappear was to record an attack with a synthesizer & reverb running. He would then record the sample of the attack + reverb playing backwards to get the desired effect.
I’ll add an excerpt here to give you a taste, but you can read the rest at Trust Me I’m a Scientist’s website:
In October, Björk released Biophilia, and the iPad/iPhone applications that allowed her listeners to interact with the album. The creative power in these apps lies in both their simplicity, and just how [...]