Networked music collaborations are technically demanding because of tight latency requirements. Typically an acoustic maximum one-way delay of 25 ms 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 might hinder a low delay transmission of audio. In this publication, we describe the algorithms implemented into the FMB. Since social distancing was imposed early in 2020, hundreds of music students and teachers have used the FMB to continue singing, playing, and rehearsing music together. This paper also reports on their experiences with the FMB.
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