The mix of the undubbed master on all releases contains no backing vocals, only the backing track.
The undubbed masters on 'Our Memories Of Elvis'
weren't really the pure undubbed masters. They
were the fully overdubbed or regular masters but
with certain instruments and backing vocal channels
removed or stripped down.
All outtakes and masters used on the Sony 3xCD
set 'Elvis At Stax' have been completely remixed
and remastered from scratch.