Hi Folks, My question relates to ACDC tones in general, but a good example can be found in Shoot To Thrill. http://www.youtube.com/watch?v=nx5Pz5fH1FA Right at the beginning, the fourth note is held and it sustains. Does anybody know how they achieve that sort of 'vocal' quality in their power chords, its hard to describe but it sort of sounds like somebody saying 'yeowwwwwww' starting when the chord is played and decaying away. The dynamic feel of this is very appealing. When I play this, the chord is uniform and doesnt speak like theirs. Is there some kind of effect applied like an autowah / flange, or is this some magical quality of the amp or guitar? Thanks for any comments.