This paper introduces Phausto, a library that generates sounds in Pharo programming language using Faust (Functional Audio Streams), a programming language designed to develop real-time digital signal processors (DSP).

In Phausto, DSP programs are created by the composition of Unit Generators written in a MUSIC-N style, like the ChucK programming language, or from a string containing a valid Faust program.

We present Phausto's API, implementation details and an overview of its syntax, and of Unit Generators and ToolKit elements. We also analyze the motivations behind the project and identify its target audiences. Finally, we present the conclusions drawn after one year of development and use, and outline the agenda for future work.