[DirectX 5 Programmer's Reference] Rolloff Factor (64.8923444976077%)

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

[DirectX 6 Programmer's Reference] Rolloff Factor (64.8923444976077%)

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

[DirectX 7 Programmer's Reference] Rolloff Factor (64.8923444976077%)

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

[DirectX October 2006 Documentation] Rolloff Factor (55.030701754386%)

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

[DirectX 3 Programmer's Reference] Rolloff Factor (52.3052843803056%)

DirectSound > DirectSound Interface Overviews > IDirectSound3DListener Interface