The opening of the cello part for in nomine tenebris
The score for in nomine tenebris was created from a sonogram of Giacinto Scelci's organ work In Nomine Lucis that was stretched, warped and distorted in the visual domain using Photoshop and Illustrator. Parts for the five instruments were created by colouring and annotating features of the sonogram (the opening of the cello part is to the left). This allows to performers to acoustically recreate minute and continuous changes in pitch, dynamic and timbre by following the height, thickness, shape and shade of the image. The players perform the work from scrolling scores synchronised in the Decibel Scoreplayer.
Conversely, the score can be repositioned by sending a /Control/Seek 0.5 message to the iPad (see below). Other currently implemented control commands are /Control/Play (start score), /Control/Reset (stop and reset score) and /Control/SetDuration (change the duration of the work). Additional commands will be added for the requirements of individual scores.