that's the one i was thinking of, i dug up my copy...it's the august 1991 issue:
the first example is how to play the intro to "cross the breeze" in the proper tuning, and then in standard tuning. all of the other examples are in the proper tunings ("cotton crown" main riff, "dirty boots" intro/verse, several parts of "schizo", and both gtr parts for "expressway").