Theres an article here from back when it was released
https://www.soundonsound.com/people/max-richter
"Once Richter had completed the demos of the tracks for The Blue Notebooks in his work room, usually with finished electronic tracks and mock-ups of the strings and piano, he went into Eastcote recording studios to record the strings. Some of the live piano was captured at Hear No Evil Studios and some again at Eastcote. Despite the digital nature of Richter's own setup, these studios were chosen because of their analogue recording credentials. "I like vinyl, I like old tape, I like old synths and instruments, and I like people that play and stuff," explains Richter. "We recorded most of the live material on old analogue equipment that Eastcote owner Philip Bagenal once bought from the old Decca studios and Paul McCartney. We used an MCI desk, recorded with ribbon microphones and without noise reduction to 16-track two-inch tape, I believe it was also an MCI tape recorder, and used plate reverbs. It was very important for me that we had a really beautiful sound. Eastcote also had a high-definition Pro Tools system, which we A/B'd with the analogue. The digital wasn't bad, and if we'd used it, you would have said 'Oh, that sounds OK.' But that's not what we were aiming for. We were aiming for 'That sounds amazing, I want to hear that again!'"
love this:
"Some people have told me that they didn't think that The Blue Notebooks was very electronic," states Richter. "But it is very electronic. It's just that the electronics aren't shiny. People associate electronic sounds with shiny and sparkly colours, but I'm not interested in that...."'
he also mentions Altiverb, which is convolution verb and comes with some very beautiful large spaces