The Audio Processing Group (GPA) is an interdisciplinary research group with members from the School of Engineering and the School of Music of the Universidad de la República, Uruguay. Its mission is the development of digital signal processing techniques and its application to audio with musical content. In particular, techniques of time-frequency representation, separation of sources in polyphonic audio and extraction of musical content (melody, rhythm, harmony, etc.). We also study the application of these techniques in problems such as content-based music search, and the analysis, transformation and resynthesis of audio for electroacoustic composition and audiovisual arts. Its members combine experience and training in signal processing, machine learning, music and technology.