Boss AC-2 Owner's Manual page 11

5 Adjust the fatness of the
sound with the BODY
knob.
6 Adjust the LEVEL knob
so that the level of the
sound obtained when
the effect is on is equal
to that obtained when it
is off.
7 If the higher frequency
ranges get distorted, ro-
tate the TOP knob
counterclockwise.
11