Side A recorded 5-11-84 at N.L. Centrum Amsterdam (live recording/no audience) by Staaltape, released in the "NL - Centrum documentatieserie".
Side B recorded in August 1984 from the first recordings of the completed "50 Gates" extended percussion set.
Text from the booklet about the extended percussion set created by Z'EV:
"The percussion system made of PVC tubes (50 gates) used by z'ev on November 2, 1984 (all souls day) at the NL-centrum."
The first edition of this release comes with another artwork and different tracklist.
Source additional information: booklet 1968-1990: One Foot In The Grave.