This invention relates to a porous pulp mould comprising sintered particles and a plurality of drainage channels. The injection coils are driven via a first switch element by a microprocessor, and injection operations of these injection coils are monitored by a first detection circuit. The various embodiments described herein provide methods and systems for converting existing mono, 2-channel andor multi-channel audio signals into spatialized audio signals have two or more audio channels. Furthermore, the apparatus includes a controller for accessing the encrypted memory portion of the memory, wherein the memory access controller is configured to employ the processed key to access the encrypted memory portion of the memory.