How to Tune a Guitar to D Flat?
Tune the low E, the sixth string, down a half step to Db (flat). To check for proper pitch, strum the fifth string while depressing the string at the fourth fret. If the tones are the same, proper pitch has been reached.
Alter the tuning of the D, the fourth string, down a half step to Db. This string is tuned to the same note as the sixth string (though a different octave), so check this string by strumming the open sixth string.
Modify the tuning of the G, the third string, down a half step to F. Check for correct pitch on this string by pressing down the first string at the first fret.
Change the tuning of the B, the second string, down a half step to Ab. This string is tuned to the same pitch as the fifth string earlier. Strum both strings in the open position to determine their relative pitch.
Complete the tuning by adjusting the high E, or first string, down a whole step and a half to Db. Verify the pitch of this string by strumming either the sixth or fourth string in the open position.
