1. 
   Gain Control
   A device that changes the gain of an amplifier or circuit, often a knob that can be turned or a slide that can be moved up arid down.
   Found op http://www.testing1212.co.uk/a.htm
   
   
2. 
   GAIN CONTROL
   An adjustable control that changes the gain of an amplifier.
   Found op http://www.glossarycentral.com/cell_phone/gain_control.html
   
   
3. 
   Gain Control
   This is a device which adjusts the gain of an amplifier. This is normally done by altering the amount of negative feedback in the amplifying system. A Gain Control is not the same as an 'attenuator' or a 'volume' control.
   Found op http://www.songstuff.com/glossary/G
   
   

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