The two modes are simple called “HP” and “LP,” one being more open and bright and the other beefier and bassier. Some say this sounds like a clone of the Fuller OCD.
You can determine that yourself by checking out this video of the Flamma Dist FC06 Distortion.
Ultrawide dynamic range and extraordinary open tube-like drive sound
Working Modes: HP/LP
True bypass switch
Very small and compact design
DC 9V adapter power supply