The straight line connects two dots, one within the matrix and on outside. It must also intersect the two long sides of the 100 by 20 cell matrix. The absolute horizontal distance between the points of intersection between the straight line and the sides of the matrix determine the length of the tape. (horizontal distance - if the line intersects the first side at cell 30 and the second side at 46, the absolute horizontal distance is 16) The length of tape determines the duration of sound.

The interaction between the matrix, straight line and the curved lines determines the tape sources.