To tune to open G tuning, first lower the sixth and fifth strings to D and G (dropped G tuning) as explained in Section 3 . Then try one of the following options to tune the first string to the high D note.
Place a left hand finger on the second string at the 3rd fret (a D note), and play the string. Play the open first string (an E note). Turn the first string tuning key slowly in a clockwise direction, lowering the pitch of this string until the open string note is the same pitch as the third fret, second string. The open first string will now be a high D note.
Place a left hand finger on the fourth string at the 12th fret (a D note), and play the string. Play the open first string (an E note). Turn the first string tuning key slowly in a clockwise direction, lowering the pitch of this string until the open string note is the same pitch as the 12th fret, fourth string. The open first string will now be a high D note.