Christina Kubisch

I listened today to Christina Kubisch's CD Five Electrical Walks. These are all sounds gathered with custom-made microphones to record electromagnetic fields. For this Cd she says the tracks are mixed pieces of audio that are not processed in any way.
Naturally, this is a composition and the walks she organizes where listeners wear these special recording headphones would have much more emphasis upon the place where one was, but as a second-hand listener, so to speak, I found the pieces pretty interesting.
It is always difficult this, the idea of removing the sounds from a place. What happens in that process?