Boss SD-2 Dual Overdrive,BOSS SD-2 - Great or Garbage?, Effects | A Flash Flood of Gear" alt="1993 Boss SD-2 Dual OverDrive (Silver Label) Yellow > Effects | A Flash Flood of Gear" />1993 Boss SD-2 Dual OverDrive (Silver Label) Yellow > Effects | A Flash Flood of Gear,Boss SD-2 Dual Overdrive: how to access all 3 modes; Red, Green & Yellow ‘on the fly’.,Boss SD-2 (It's a Dual Overdrive)