Just out of interest Mickey Hart and Phil Lesh did a 5.1 remix of Workingmans Dead and American Beauty in which they included a lot of steel Garcia wouldn't let them use on the original as he didn't think it was good enough.
I have the surround version of American Beauty on DVD Audio which won't play now on my Sony player as they had a different surround format on the go. From what I remember there was some sweet steel worth listening to, been meaning to rip the dvd for years and get the separate tracks into a different format so I can listen to it again. You can buy surround tracks for both albums I believe but from memory they're not cheap.
Been a Deadhead since the early 70's, saw them twice, in 1972 at the Bickershaw festival, Gracia also played some steel with The New Riders of the Purple Sage who were the support act and London 1974 I think,

, when they had the wall of sound. 1972 was definitely the best one.