Show HN: Beatsync – perfect audio sync across multiple devices

Re:Show HN: Beatsync – perfect audio sync across multiple de... by freemanjiang on Tuesday April 29, 2025 @04:23PM (#43837626)

Yeah the threshold is pretty brutal, but it is enough. Experimentally, I'd say you need under 2-3ms but even at 1ms you can start to hear some phase differences.

Most of the time, I think my synchronization algorithm is actually sub-1ms, but it can be worse depending on unstable network conditions.

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Re:Show HN: Beatsync – perfect audio sync across multiple de... by mkishi on Tuesday April 29, 2025 @05:48PM (#43838425)

How are you measuring this? I'm surprised the Web Audio API scheduling system has that much insight into the hardware latency.

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Re:Show HN: Beatsync – perfect audio sync across multiple de... by urbandw311er on Wednesday April 30, 2025 @08:20AM (#43844173)

I was wondering that too. It’s an impressive demo when used on devices with low latency audio drivers but I’m not convinced there’s any ability to detect drift beyond this. Might be interesting to have an option to use microphones to detect and calibrate this… …but then you have the same issue of an unknown delay on the microphone input too.

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