You could sign the petition at Change.org that we started five years ago. (Well before the Atmos-fuelled resurgence of immersive mixing--so the petition's language is probably due for an update.)
https://www.change.org/p/universal-...ease-release-steely-dan-s-early-albums-in-5-1
As for
Aja: that story has been told elsewhere. The multitracks for "Black Cow" and "Aja" went missing years ago, although the details and circumstances of their disappearance are murky. (
@fredblue recently mentioned a rumor--a report?--that "Black Cow" may have turned up.) We have it on the authority of Irving Azoff, Elliot Scheiner, and Randy Aronson (the Universal archivist who was the source for the
famous New York Times story) that all other multis--at least those for completed album tracks--are safe in Iron Mountain, and did
not perish in the 2008 Universal Studios fire.
Neither Becker nor Fagen were ever opposed to having their material remixed for surround. When Fagen's last album,
Sunken Condos, was released 2012 and he was asked in a published interview about the possibility of a surround mix, he brushed it off--not because he didn't want one, but because he thought there was no longer enough interest in surround to make it pay. Obviously, a decade later, that's no longer the case. Elliot Scheiner isn't interested in Atmos, however, so if UMe wanted to commission Atmos mixes of the first seven albums, they'd probably have to get Azoff, Fagen, and Delia Becker to sign off on using some other mixing engineer.
