3 position Contour selector provides a trio of vastly different mid
Contour Position 1 - drops
the low mids and creates a rounder, fuller fat bottom end.
Contour Position 2 - boosts the midrange, giving greater edge
and aggression to your sound.
Contour Position 3 - moves the mid range higher than you would
normally expect on a bass amplifier. This adds an aggressive twang
while leaving the essential body of your tone intact, making it ideal
for percussive styles such as slap bass.