Alternate Tuning Guide - Open D Tuning - D A D F# A D. Listen to MP3 of this tuning Tuning TipsTune your sixth string down a tone to D.
Check the tuning with the fourth (D) string.Tune your third string down a semitone to F#. Check the tuning with the fourth fret of your fourth string.Tune your second string down a tone to A. Check the tuning with the fifth (A) string.Tune your first string down a tone to D. Check the tuning with the fourth (D) string. Peterson Strobe Tuners - Cents to Frequency Calculator. Guitar Tuner @ HowToTuneAGuitar.org.