PKEY_CompositeFX_EndpointEffectClsid
In Windows release 1803 and later, the PKEY_CompositeFX_EndpointEffectClsid property key identifies the end point effects (EFX) in place. The driver developer should specify the list of supported processing modes that their driver supports.
This property key is identical to the PKEY_FX_EndpointEffectClsid property key, but it is a composite that is expressed as a reg multistring in the registry to allow multiple effects in a single position.
The INF file property key instruct audio endpoint builder to set the CLSIDs for endpoint APOs into the effects property store. This information is used to build the audio graph that will be used to inform upper level apps what effects are in place.
INF File Sample
An INF file specifies the default format for an audio endpoint device in the add-registry sections for that device. The following INF example shows the strings and add-registry section that loads the APO for endpoint effects into the registry.
[Strings]
PKEY_CompositeFX_EndpointEffectClsid = "{D04E05A6-594B-4fb6-A80D-01AF5EED7D1D},15"
...
SWAP_FX_MODE_CLSID = "{00000000-0000-0000-0000-000000000000}"
DELAY_FX_STREAM_CLSID = "{00000000-0000-0000-0000-000000000000}"
...
[SWAPAPO.I.Association0.AddReg]
HKR,FX\0,%PKEY_CompositeFX_EndpointEffectClsid%,0x00010000,%SWAP_FX_MODE_CLSID%,%DELAY_FX_MODE_CLSID%
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