If you're not familiar with the processor Jim mentioned, you're not alone. It isn't available to the public yet (availability is expected within 18 months, if memory serves). But, compared with the other surround matrices available (SRS, Dolby, etc.) it is fairly impressive. Occasionally, some stuff does still show up in surprizing places on playback, but overall it seems to work fairly well. It's also compatible with currently available matrix decoders.