“Digital Rainbow” is a computer-generated tape based completely on sound synthesis. Fully generated by the computer, all signal processing was designed by visual programming of networks of digital unit generators holded in Pure Data patches (Extended Version 0.39). The music material of the work was entirely generated within the patches, by the employment of a multiple carrier FM synthesizer and random sequences of events.

Different kinds of musical material evolved, and through experimentation with the patches sound possibilities, several sound objects were exported as audio files into a digital audio workstation (Logic Express 7), in order to benefit the audio mixing of the tape. All digital audio was processed at 24 bits-44.1 KHz.

A visual score was drawn once the tape composition was over, in order to graphically represent the musical discourse inside the work. The visual score was made by drawings and symbols based on functional analysis developed by canadian musicologist and composer, Stéphan Roy.