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How to Enable Awesome HRTF Sound Effects in Linux Games

The latest version of OpenAL has a new feature that can enable some pretty neat sound effects for Linux games that use OpenAL.

This new feature is a filter that simulates Head-Related Transfer Function (HRTF) if a pair of stereo headphone is in use. Some headphones has built in HRTF support but this filter will simulate HRTF effects in an ordinary stereo headphones as well.