Boss OC-3 Super Octave Owner's Manual page 6

Panel Descriptions
fig.02
7 8
6
9 10
7. DIRECT LEVEL Knob
This adjusts the volume of the direct sound.
Turn the knob to the right (clockwise) to in-
crease the direct sound.
This adjusts the total volume level when the
MODE knob (10.) is set to DRIVE.
8. OCT1 LEVEL (-1 octave level)
Knob
This adjusts the level of the sound one octave
below the original. The volume of the sound
one octave down increases as the knob is
turned to the right.