SAPI 5.1 FacePoser Error
If you get an error SAPI 5.1 Unable to create recognizer context
when you click Redo Extraction in FacePoser, it means you need to install the Microsoft Speech SDK.
If you have already installed SAPI 5.1 and still receive the error a common reason is the audio file needs to be placed in the right folder for faceposer to find. Add the file to your mod in <Steam Dir>/SteamApps/SourceMods/yourmod/sound
or alternatively in the HL2 sound folder at <Steam Dir>/SteamApps/common/half-life 2/hl2/sound
where X is the volume in which Steam is installed.