Stereo width – is it relative stacking? – Production Techniques Forum

I am trying to produce my score, but I am getting confused.

I have 3 racks for the sequences (for example: cello, viola, violin). I set these at 40% stereo width.
Next, I direct the output of these 3 racks to an another rack (‘amplifier strings’). This rack contains the MuTools audio processor module ‘amplifier’. On its track, I select gain as automation type and stereo width as sub-automation track.
This is the second stereo-width knob.
Next, the output of the amplifier rack is directed to the Master Output. This output also has a default stereo widening knob. This is the third stereo-width knob.

By now, I am at a loss.
For example: each instrument is set at 40% width. The second knob (on the amplifier) is at 100%. Is the end result then 40% or 100% width? And can the same be applied for the 3rd (master) knob?

And does the same principle applies for panning?