This are graphic representations made with pigment using old printers, that register a code-score with diferent paramenters. The compositions are made for mechanic instruments of 1-bit by the mexican composer Victor Adán.
The UPIC is a large-size digitizer table (75 by 60 cm) on which the user designs his music using an electromagnetic pencil, made by Iannis Xenakis in 1978.
At the other end of the UPIC system, the digits are converted into sound through the loudspeakers. Two screens allow the permanent dialogue between man and machine.
You can use the UPIC system in 4 steps: 1. draw waves (the timbers you want to use); 2. draw envelops (variation of volume and duration)3. compose a page (general shape of the composition); 4. mixage.