Steve Hoffman did the remaster on the regular CD audio.
The interesting thing about the Greatest Hits package is that a lot of the singles were mono only, in that proper stereo mixes were not made, since they weren’t intended for release on an album, back when it was customary to release mono and stereo mixes. What Epic Records did was “electronically reprocess” some songs to be fake stereo, so one channel had a lot of high end, the other channel had a lot of low end. Then something happened. A few years later, when quadraphonic albums were the hip thing to do, they went to the multi-tracks to make all new mixes for the album. In the process, by making quad mixes in stereo for the vinyl pressing, it essentially was the first time three songs made their stereo debut, including “I Want To Take You Higher”, “Thank You (Falletinme Be Mice Elf Agin)”, and “Hot Fun In The Summertime”. For the longest time, the quad mix became the hit album to get for those who preferred hunting down true stereo mixes. Slightly different stereo mixes were later released on compilation albums in the 80’s and 90’s but now you’ll be able to it in all of its true quadraphonic glory on the SACD. No word on if the stereo or quad-in-stereo mix was remastered.
(Mahalo nui to Tom Hayes for the tip on both discs.)