Remote Music Synchronization

Remote music synchronization is the coordination of musicians performing in different physical locations so that their individual audio aligns to a shared timing reference, producing a single, rhythmically unified result despite the delay of the internet between them.

Unlike a video call, it demands timing accuracy on the order of milliseconds, because the human ear hears an ensemble as "out of sync" once parts drift more than roughly 25 milliseconds apart. It is the core problem Lyrekos was built to solve.

Audio latency is the delay between when a sound is produced and when it is heard at the other end of a connection.

In remote performance, latency above about 25 milliseconds makes playing together in real time feel ragged or impossible. Standard video-conferencing tools routinely run 100–300 milliseconds — fine for conversation, fatal for music.

The 25-millisecond threshold is the approximate point at which timing error between two musicians becomes perceptible and disruptive.

Below about 25 milliseconds, parts feel locked together; above it, ensembles audibly drift apart. It is the practical dividing line between music and cacophony for synchronized performance.

A backing track is a pre-recorded or generated audio reference — a piano part, a full instrumental stem, a metronome click, or a drone — that every performer follows so that staying together no longer depends on hearing one another in real time.

The shared reference is what makes synchronization across distance possible. Backing tracks vary widely in origin and fidelity; choosing the right one is its own question.

Asynchronous synchronization is an approach to remote performance that sidesteps internet latency rather than fighting it: each performer locks to the same fixed reference locally, and their contributions are aligned to that reference instead of streamed to everyone in real time.

Because no one is waiting on the network to stay in time, distance and connection speed stop affecting synchronization. This is the principle behind Lyrekos’s sub-20-millisecond results across continents.

Jitter is the moment-to-moment variation in network delay.

Even when average latency is low, inconsistent timing makes real-time audio unstable. Reference-based synchronization is resilient to jitter because timing comes from the local backing track, not the live stream.

A click track is a steady metronome pulse used as the simplest possible timing reference.

It carries tempo and nothing else, which makes it ideal for tight rhythmic coordination and for learning, where pitch and richness would only get in the way.