DirectSound is a library of objects for recording and playing sounds with very low latency, and for allowing your game a high level of control over the sound pipeline. It also includes a system for 3D sounds (playing the sound in such a way that it seems to come from a specific direction) and a system for applying effects to sounds (like 'echo' and 'gargle').

DirectSound is part of the DirectX library.

External links

Microsoft's DirectSound documentation