The aim is to find and fix the biggest problems in virtual mode, before ground is struck in December.

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For example, the virtual mode is ideal for enhancing traditional two-channel stereo sources such as a CD by creating rear ambience.

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Used with the surround speakers attached, the HTL9100 operates as a single sidebar offering high quality stereo or a wide sound stage via virtual surround sound mode.

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Valve Software's experiments with virtual reality, most recently exposed as a " VR Mode" of its popular free-to-play shooter Team Fortress 2, are actually just an offshoot of the company's longer-term goal: augmented reality.

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