From the liner notes:
In mid 1998 several soundartists received among an inquiry for this project a cd with an handmade lockgroove carved into its upperside. This lockgroove contained an individual soundquality because of its handmade origin and had to be taken off with a record player. The token sounds were meant to be used as raw-material for further worked out remixes. The mode how this lockgroove was taken off by the record-players' pick-up as well as further processing and manipulating the worked out material was completely open to the interpreting artists. The here presented compact-disc compilation contains 10 tracks worked out of the original cd-lockgroove (playable on any usual compact-disc player) plus an handmade lockgroove on the upperside of the cd (a record player without automatic pick-up device and some sensible precision motoricity required), similar to the one which the sound-artists received as original material at the beginning of this project.
Track 11 is the lockgroove which is on the upperside of the CD.