Using The Footswitch/Tuner FT01 : - note 1 - note 2 - note 3 - note 4 - note 5   Note 5:   The stationary wheel indicates the note is now in tune.   Tips for accurate tuning.   1. Pluck cleanly only the required string. 2. Lightly mute the other strings to stop them vibrating during the measurement. 3. To stop the measurement, mute all strings until lamps 1 thru 6 light.