Hopefully the Stax experts ( Rob Bowman perhaps ? ) can come on here and advise us of the true position, but I always surmised that those Stax LPs from the late 7Ts and early 8Ts on Randy Brown, the Staples and the Emotions (of previously unreleased material) were in fact finished tracks from the mid seventies which were ... let's say ... "surgically enhanced" with modern production devices to make them sound "of their time", not re-recorded or newly recorded rhythm tracks.