#1
Just got it today. Saaweeeet

Anyway, on the back of the amp, there is a switch. It has three choices. A/Off/B. Is there a certain setting to put it on? I downloaded the manual, to no avail.

I live in the States if that has any affect on anything (grounding methods...idk)
#2
Just try off for now.

BTW, no clips or pics?
Call me Wes.
Gear:
Fender American Deluxe HSS Strat
Chicago Blues Box Roadhouse
Bad Cat Cougar 5
1957 Gibson GA-5
Ceriatone 18w TMB Combo
Hughes & Kettner Tube Factor
Various Ibanez TS9s
Weber MASS Attenuator
#3
"GROUND
This switch is often helpful in reducing buzzes which originate in the AC power wiring outside the amplifier. We recommend leaving the
switch in its center OFF position unless position A or B definitely helps. In the center OFF position, your Boogie cannot be the source of
annoying "ground shocks" to the microphones etc."

Taken from the Manual of the Mark III

Kramer Focus 3000
Ibanez ATK300
Rocktron Chameleon
Digitech IPS33B
Ibanez WH10
Korg Pitchblack
Line6 UX2