The Action Cable Symphony - An Illustrated Musical Adventure
summary
A Rails app converts MIDI to JSON, splits tracks into per-instrument ActionCable channels, and assigns roughly a hundred phones as players; clients synthesize sound with Tone.js and sync clocks against the server using Timesync.js while sessions use JWT for stateless auth. Demo hits real-world limits—conference Wi‑Fi forces a localhost fallback and visible latency/outlier devices—but local runs work. Notes: scalability concerns, AnyCable mentioned as an alternative, and clock offsets require buffering and client-side offsets to sound coherent.
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chapters (8)
- 0:00Intro
- 1:14Getting Started
- 3:59Testing
- 7:39Overview
- 15:53Clients
- 17:29Playing Music
- 23:40Latency
- 31:26Conclusion
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