Nowadays the use of computers to replace specialized (and expensive) audio equipment in studios, live concerts and composing is a reality. This paper introduces Medusa, a distributed sound environment that allows several machines connected in a local area network to share multiple streams of audio and MIDI, and to replace hardware mixers and also specialized multi-channel audio cables by network communication. Medusa has no centralized servers: any computer in the local environment may act as a server of audio/MIDI streams, and as client to remote audio/MIDI streams. We discuss the implementation of Medusa in terms of desirable features, and report user experience with a group of composers from the University of São Paulo/Brazil.