Source Audio Soundblox 2 OFD Bass microModeler - Manual (Page 11)

Controls: Buttons | 11
TONE SHAPE
There are three selectable tone control options: TREBLE, MID, and BASS.
This control works in conjunction with the TONE knob. Press the TONE
SHAPE button to scroll through the three tone control options. The TONE
knob will adjust the level of cut or boost for the selected TONE SHAPE.
The three tone shapes can be set independently and will not affect each
other. If you need to quickly set all of the three bands back to the default
flat setting, simply press and hold the TONE SHAPE button for 2 seconds.
The TREBLE, MID, and BASS LEDs will blink three times rapidly to show
that they have been reset.
FACTORY RESET
Should you wish to perform a factory reset, unplug the power supply from
the pedal, then press and hold the TONE SHAPE button while plugging
the power supply back in. Continue holding the TONE SHAPE button until
the 1 and 2 preset LEDs blink in succession — this will erase any saved
presets.
TONE
SHAPE
TREBLE
MID
BASS
(HOLD)
FLAT
Press button to
select option