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Joyrex J4 EP
EP by Caustic Window
Released	July 1992
Genre	Acid house
Length	18:53
Label	Rephlex Records CAT 004 EP
Richard D. James chronology
Xylem Tube EP (1992) Joyrex J4 EP (1992) Joyrex J5 EP (1992)

Joyrex J4 EP is an EP by Richard D. James under the alias Caustic Window. The release is a 12 inch vinyl and has been pressed with both yellow and black labels.

All tracks except "Pop Corn" were later re-released on the album Compilation.

1. "Joyrex J4" – 4:27
2. "Pop Corn" – 3:38
3. "AFX 114" – 1:20

1. "Cordialatron" – 4:43
2. "Italic Eyeball" – 4:24
3. "Pigeon Street" – 0:21

• No track titles appear anywhere on the release; however, track titles came from the later release of Compilation, except for "Pop Corn" which is so called by fan-interpretation of the song written by Gershon Kingsley.

• Joyrex J4 EP at AllMusic. Retrieved 14:13, 4 May 2016 (UTC).