Setting And Sounds - Gallien-Krueger Backline 210 Owner's Manual

The Backline 350/210 is versatile in its sound and tone. Below
are a few suggested amp settings that can be used as starting
points to define your own sound.
Note: the Gain/Overdrive settings will vary according to the
output of your bass.
* Contour note:
At higher playing levels the contour should be set lower for mid-range clarity. To get
the 800RB contour voicing, the contour should be set to 0 or 10 only.