The FX12 Tuner pedal is DOD's answer to all of the prayers of musicians who have been on a dark stage, or at a recording session and out of tune with no place to go. Those days are gone thanks to the FX 12 Tuna pedal. The FX 12 will tell you what note you are playing and if that note is flat. The FX12 also has a Precision Tune LED graph to let you know how sharp or flat the current note being played is.