Hi Mark,
The masters are no longer with us as they were privately purchased. However, as I recall there was only the choir and maybe some odd violin phrases that hadn't already been coverted to 1" loop masters on very sheddy Ampex 456. The raw takes were long gone so there was nothing we could do to reconstitute the original takes. The necessary 'start' info was missing. I'll check out the violin phrases again as they may be of some use but that's about it. There was a whole collection of instruments that were NOT mellotron derived but nothing we could work with. We did try playing a loop master and it clogged the heads in about as much time as it's taken to type this!
Best,
Martin