From Stephen Desper
"Modern use of a multi-track is just to use it for stacking tracks. I did not use the multi-track stage like most. For me it was just a means to an end -- the Master Mix 2-channel Stereo Mix. Therefore my multi-tracks cannot be used for re-mixing because about 30% of the Stereo Mix is via re-amping and cannot be duplicated, the Multi-track is full of cuts and some of the oxide is wiped. In some parts multiple lead tracks were used and only Carl knows which tracks are "on" at which time or what to use and what to discard. Further, other tracks were distend to be processed through any of several matrix topologies, no longer available.
The best hearing of Sunflower and Surf's Up are from my book Recording The Beach Boys in which these albums are resolved through the final matrix and the source is from the original Mastering Sessions under Carl Wilson and my direction. All other masterings and/or so-called re-mix attempts would not reflect the tonal and mastering directions of The Beach Boys -- thus would not be "produced by The Beach Boys," but someone else who was probably not even alive at the time these albums were recorded.
My Book will be posted as a study-video in about three or four weeks at this message board. If you connect your computer to a good 2-channel stereo sound system, you will hear a virtual surround mix as it was originally intended to be heard by the producers. I.E., the sound will be unlike anything you have heard before.
The release date for Feel Flows box set is July 22, 2021"