The Fastmusic Box: Networked Musical Lessons Networked musical lessons are technically demanding because of tight latency requirements. Typically, an acoustic one-way delay of 25 milliseconds or less needs to be achieved if two musicians want to play in sync. We have developed the Fastmusic Box (FMB), a system that automatically analyzes the given system and network setup to identify all issues which hinder a low delay transmission of audio. In this publication, we describe the algorithms implemented in the FMB. Beside these technical aspects, hundreds of music students and teachers used the FMB to continue to sing, play and rehearse music together during the last months of social distancing. This paper reports on their experiences.
