Often, they would use different open tunings for their two guitars.
Some, but not all, styles use double stops and open tunings.
Of course, using standard tuning, notes on the first or second string need to be played one fret higher.
Using standard tuning, notes on the first or second string need to be played one fret higher than this.
He also uses alternate tunings and plays several different styles.
During this time he began to develop his unique playing style, using alternate tunings, and writing original material.
Usually, a slide player will use open tuning, although standard tuning is sometimes used.
As well using standard tuning he utilises a number of guitar tunings.
Kath did not use special tunings or unusual guitar modifications.
In addition to standard guitar tuning, Jack White also uses several open tunings.