PKEY_FX_Offload_StreamEffectClsid
In Windows 10, version 1511 and later, the PKEY_FX_Offload_StreamEffectClsid property key identifies the stream effect (SFX) supported by the driver that will be loaded during offload playback. The driver developer should specify the list of supported stream effects that their driver supports for the offload pin.
The INF file property key instructs the audio endpoint builder to set the CLSIDs for stream-effect APOs into the effects property store for offload. 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 settings for an audio processing mode effect in the add-registry section for that device. The following INF example shows the strings and add-registry sections that loads the streaming processing modes supported into the registry.
[Strings]
PKEY_FX_Offload_StreamEffectClsid = "{D04E05A6-594B-4fb6-A80D-01AF5EED7D1D},11"
...
; Driver developers should replace this CLSIDs with that of their own APO
FX_STREAM_CLSID = "{00000000-0000-0000-0000-000000000000}"
...
[SWAPAPO.AddReg]
HKR,"FX\\0",% PKEY_FX_Offload_StreamEffectClsid %,,%FX_STREAM_CLSID%