| Microsoft DirectX 8.1 (Visual Basic) |
A parametric equalizer amplifies or attenuates signals of a given frequency.
Parametric equalizer effects for different pitches can be applied in parallel by setting multiple instances of the GUID_DSFX_STANDARD_PARAMEQ effect on the same buffer. In this way, the application can have tone control similar to that provided by a hardware equalizer.
This effect is represented by the DirectSoundFXParamEq8 object. Its parameters are contained in the DSFXPARAMEQ type.