So my copy of ulster hall 1971 seems to have 3 sources. One that sounds decent, one that sounds bad (with an annoying whistle thing) and one is really good but it barely lasts at all. The has to be more of that source right? I mean it's probably lasts less than a minute and a half during stairway. Also is there a version of the show with out the horrible whistle? Any one got any ideas? Is there ever a chance we'll find more of that really clean source? Kind of curious what thoughts you all might have on this