Different Absynth 5 DLL's

There are four Absynth 5 components in my VST folder: Absynth 5, Absynth 5 FX, Absynth 5 FX Surround and Absynth 5 Stereo. What is the difference between Absynth 5 and Absynth 5 Stereo? Is the first one mono?

 

The difference is the number of outputs:

- Stereo version has only 2 outputs.
- Non-Stereo version has 6 outputs (for surround sound) ...

And the FX versions are basically for using Absynth as audio effects engine (instead of an instrument) and running external audio through ...

 

I should be using the one called 'Absynth 5 Stereo' then.
There is a plugin named 'Absynth 5 FX Surround, but not sure if it applies to the instrument or not.

 

Depending on what you want to do, use the appropriate Instrument or Audio FX version:

• Absynth 5: (surround) Instrument version with 6 outputs
  
• Absynth 5 Stereo: (stereo) Instrument version with 2 outputs

• Absynth 5 FX Surround: (surround) Audio FX version with 6 outputs
  
• Absynth 5 FX: (stereo) Audio FX version with 2 outputs