Loud: Sets output volume level with the Burn control. Is guaranteed to be loud enough in any use.
Burn: Burn control affects the bite of the pedals. Does not bring a lot more gain but raises volume and brings the guitar sound more presence towards 5 o'clock.
Dirt: Sets the amount of gain. Pretty much an on/off control. At 7 o'clock there is very little gain. At 9-10 o'clock there is a lot of gain and it does not rise significantly towards 5 o'clock after this point.
Power Requirements: 2,1mm 9V DC centre negative power supply or 9V battery. About 20 mA.