frippertronics

frippertronics is a specific tape looping technique used by Robert Fripp.^[1] It evolved from a system of tape looping originally developed in the electronic music studios of the early 1960s that was first used by composers Terry Riley and Pauline Oliveros and made popular through its use in ambient music by composer Brian Eno.

frippertronics (a term coined by poet Joanna Walton, Fripp's lover in the late 1970s) is an analog delay system consisting of two reel-to-reel tape recorders situated side-by-side. The two machines are configured so that the tape travels from the supply reel of the first machine to the take-up reel of the second, thereby allowing sound recorded by the first machine to be played back some time later on the second. The audio of the second machine is routed back to the first, causing the delayed signal to repeat while new audio is mixed in with it. The amount of delay (usually three to five seconds) is controlled by increasing or reducing the distance between the machines.

fripp used this technique to dynamically create recordings containing layer upon layer of electric guitar sounds in a real time fashion. An added advantage was that, by nature of the technique, the complete performances were recorded in their entirety on the original looped tape.
in the mid-1990s, Fripp revamped the Frippertronics concept into "Soundscapes", which dramatically expanded the flexibility of the method using digital technology (delays and synthesizers).