The APO tool is view only, it cannot apply any options on the first page. These options are setup either directly inside the APO.dll, via RTKHDAUD.dat, or via settings in the drivers .inf file.
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@Alan Finotty HDX_AllBrandExt_RTK_UAD.inf requires updating, its using an older registration system and [Digital.AddReg] has some potential mistakes.
PKEY\_CompositeFX\_Offload\_StreamEffectClsid - Windows drivers | Microsoft Docs
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[Digital.AddReg]
HKR,"FX\\0",%PKEY_DisplayName%,,%RT_FriendlyName%
HKR,"FX\\0",%PKEY_Composite_SFX%,0x00010000,%GUID_RT_APO_SFX%
HKR,"FX\\0",%PKEY_Composite_MFX%,0x00010000,%GUID_RT_APO_MFX%
HKR,"FX\\0",%PKEY_SYSFX_EFX%,,%GUID_RT_APO_EFX%
HKR,"FX\\0",%PKEY_Composite_Offload_SFX%,0x00010000,%GUID_RT_APO_OSFX%
HKR,"FX\\0",%PKEY_Composite_Offload_MFX%,0x00010000,%GUID_RT_APO_OMFX%
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[Digital.AddReg]
HKR,"FX\\0",%PKEY_DisplayName%,,%RT_FriendlyName%
HKR,"FX\\0",%PKEY_CompositeFX_StreamEffectClsid%,%REG_MULTI_SZ%,%GUID_RT_APO_SFX%
HKR,"FX\\0",%PKEY_CompositeFX_ModeEffectClsid%,%REG_MULTI_SZ%,%GUID_RT_APO_MFX%
HKR,"FX\\0",%PKEY_CompositeFX_EndpointEffectClsid%,%REG_MULTI_SZ%,%GUID_RT_APO_EFX%
HKR,"FX\\0",%PKEY_CompositeFX_Offload_StreamEffectClsid%,%REG_MULTI_SZ%,%GUID_RT_APO_OSFX%
HKR,"FX\\0",%PKEY_CompositeFX_Offload_ModeEffectClsid%,%REG_MULTI_SZ%,%GUID_RT_APO_OMFX%
[Strings]
REG_MULTI_SZ = 0x00010000
- Not that string names matter much
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Disabling enhancements should be related to SFX MFX.