| Sumario: | This paper presents two large-scale compositional projects that have been realized using a Lisp-based visual computer-assisted composition environment. As such, the system does not force the composer to use a predetermined aesthetic framework. In order to meet the specific needs of individual composers, a user-library scheme is provided that allows one to augment the kernel part of the system with modular software packages. In our first case study, dealing with the realization of the pitch material for Lindberg's orchestral work Engine, we discuss the constraints system used by the composer. In the second case study we present the underlying user-library 'Viuhka' that was used to realize a 15-part electroacoustic work for tape by Heininen. We end with a discussion that lists some of the experiences that the composers came across during the compositional process.
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