Yamaha CS80

Hi people
Again merry christmas to all!
4 easy questions: 
  1.. What is the "high/low" switch near the outputs of the CSs made for?
  2.. Does anyone have informations about the designers of the poly CS series? I know it was designed in US
  3.. Did you notice that , at full depth , the Decay segment into the ringmodulator's AD has a "hold" time of 0.5 secs?
  4.. this is about GX1: can anyone explain me what does mean the horizontal movements sensitivity in the SOLO keyboard?
Anyone able to answer to any of the questions?
Salutes!
M

[Non-text portions of this message have been removed]