Tube Booster..what is "Dual Servo" ?

[petemoore]

Interesting history of the Presonus guys, 
http://en.wikipedia.org/wiki/PreSonus
  Award-Winning Dual Servo Tube-Preamp
  What does 'Dual Servo' mean in terms of...
  What is it?, what does it do?, how does it work ? 
  Just curious really, I could use another couple channels...
  Micing for recording last night, then slamming the input of my 15w tube amp, then running the condenser Mic'd accoustic straight into the 3-way powered Mackie, then the LP into the 1/4'' input...I realized this is a useful type of item to have around, 2 or 3'd be ok too.
 
 

[alanlan]

Well, a servo is just a feedback control system, so I would have thought it could mean having 2 feedback loops (perhaps an inner and outer loop) but I'm just guessing.