[DirectX October 2006 Documentation] Perception of Sound Positions (70.9752321981424%)

DirectX SDK > Introducing DirectX 9.0 > Direct3D Graphics > DirectSound > 3-D Sound

[DirectX 3 Programmer's Reference] Perception of Sound Positions (49.6571906354515%)

DirectSound > DirectSound Overview > Three-Dimensional Sound

[DirectX 5 Programmer's Reference] Perception of Sound Positions (47.6787101787102%)

DirectX Foundation > DirectSound > DirectSound Essentials > DirectSound in 3-D

[DirectX 6 Programmer's Reference] Perception of Sound Positions (47.6787101787102%)

DirectX Foundation > DirectSound > DirectSound Essentials > DirectSound in 3-D

[DirectX 7 Programmer's Reference] Perception of Sound Positions (47.6787101787102%)

Microsoft DirectX 7.0 > DirectSound > DirectSound Essentials > DirectSound in 3-D

[DirectX October 2006 Documentation] Perception of Sound Positions (44.4922402159244%)

DirectX Audio > DirectSound > Programming Guide > Sounds in 3D