Chicago has seen several remasterings over the years: the original Joe Gastwirt masters, the Doug Sax remaster for the CBS Masterdisc (CTA), the Mark Wilder remaster for the Group Portrait box, and the new ones done by Dave Donnelly for Rhino. I've heard that the recording methods used by their producer, James William Guercio, make mastering these tapes a challenge in some respects. Anyone have a comment on this? And does anyone know why the tapes seem rougher--more dropouts, more buzzes and clicks--on the recent Donnelly remaster of CTA than they have before? I'd particularly love to hear from Mark Wilder, whose work on the Group Portrait box I have long admired--it really hits a sweet spot and presents the music very well, to my ears.