45R is a reconstruction/remix of 45, which appears on Kaminaritaki. The remix was made in January 2013.
87S is a recording made in 2010 for the compilation album "Exquisite Cadaver Vol I" released by Bleeemo Music.
Dalan is a remix of material recorded for Sekai for the compilation album "Ass Jazz Vol. 3" released by Pet Goat Records.
Hichiriki is a remix of the hichiriki (Japanese traditional double reed instrument) recordings for Sekai. The same recordings were also used for Dalan, and the remix was made shortly after Dalan was mixed.
Sekai 10xR is the one-track album Sekai (White Edition) at 10 times the original speed and played backwards. (It was originally a placeholder for that album, prior to release.)