An audio processing system processes an audio signal that may come from one or more microphones. A delay line delays the discontinuous flow by a delay interval. The cylindrical body and the branching guides convey paper to a processing unit that processes the paper and to an ejection tray. This creates a stiff center and a more easily deflected concentric portion. The permeable body can be heated sufficient to liberate hydrocarbons therefrom and the hydrocarbons can be collected from the permeable body.