[DirectX 8.1 Visual Basic Programmer's Reference] Compression (100%)

DirectX 8.1 (Visual Basic) > DirectX Audio > Using DirectX Audio > Using Effects > Standard Effects

[DirectX October 2006 Documentation] Compression (78.9473684210526%)

DirectX Audio > DirectSound > Programming Guide > Using Effects > Standard Effects

[DirectX October 2006 Documentation] Compression Presets (34.0789473684211%)

DirectX Audio > XACT > XACT Audio Authoring