Tweek Mode : - note 1 - note 2   Note 2:   Having pressed EDIT/TWEEK, the lamps above Bass, Treble and Reverb light to indicate Tweek Mode is now on (see note 1).   Itís like having separate master Bass, Treble and Reverb knobs.   For Bass and Treble knob . . . .     mid-way: no boost/cut.     maximum: full boost.     minimum: full cut.   For Reverb knob . . .     maximum: full programmed level.     minimum: off