Phaedra

Froese played Mellotron, guitar, bass, VCS 3 and organ, and painted the cover; Franke played Moog and VCS 3, and Baumann organ, electric piano, VCS 3 and recorder. The recording took about two weeks. Franke's modular Big Moog, bought from Bruce Hatch for a reported $15,000, and its 960 Sequential Controller were central, and it was their first album to use a sequencer for rhythm. Baumann says the title piece was recorded first, from Franke's noodling on the new sequencer. Froese said that by day eleven they barely had six minutes of music on tape, that tuning took hours and that low bass notes damaged speakers; the Moog drifted out of tune during the title piece, and a children's sound-effect coda was added in mixing. Franke said they had no one to copy and started from scratch.

"Mysterious Semblance at the Strand of Nightmares" is a Froese solo on Mellotron with phasing effects, and "Sequent C'" a Baumann solo on a wooden recorder with multiple delays. AllMusic and Sputnikmusic give it five stars, it is in 1001 Albums You Must Hear Before You Die, and the All Music Guide to Electronica calls it one of the most important works in the history of electronic music. A 2019 remaster added Steven Wilson stereo mixes, and a 50th anniversary edition on April 18, 2025 added outtakes and the complete Victoria Palace Theatre concert of June 1974, the band's first UK live appearance.