The sound of a buzzing bee jumps from left to right before disappearing around the back of my head.
The surround sound demo is unremarkable when heard on a 
multi-speaker home cinema system but startling when emerging from a small mobile phone.
British firm Sonaptic is one of a number of companies to have developed 3D audio technology that emerges from stereo speakers.
Firms AM3D and SRS both offer stereo-widening technology for mobile phones.
But Sonaptic’s managing director David Monteith says his firm is the only company to offer positional 3D audio on a mobile.
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