Synced group audio · no streaming
MR Player plays music from each phone's own storage, locked to a shared clock. The network carries a few bytes of timing every few seconds — not audio. So it keeps working in forests, tunnels, basements and packed festival fields, exactly where group-listening apps fall apart.
Built for running crews. Used for silent discos, outdoor classes and guided tours.
The organiser uploads tracks and builds playlists. Everyone's phone downloads them over Wi‑Fi before the session — verified file-by-file, so nobody starts with a missing song.
Each phone works out the exact offset between its clock and the session clock, the way NTP does — filtering out network jitter so the estimate stays honest on a bad connection.
The Maestro starts the set. Every phone schedules the same audio frame at the same instant. Tracks crossfade together, and the queue advances by itself.
Tiny inaudible speed nudges hold the group together over a long run, and each device compensates for its own speaker or Bluetooth delay.
| Streaming apps | MR Player | |
|---|---|---|
| What crosses the network | The audio itself, per person | A few bytes of timing |
| On weak signal | Buffers, drops out, desyncs | Keeps playing in sync |
| No signal at all | Stops | Keeps playing |
| Subscription needed | Every listener | None — it's your own files |
| Your own recordings / edits / mixes | Not supported | Yes — that's the point |
Keep the pack on the same track through parks, tunnels and dead zones — no earbud handoffs, no "wait, where are you in the song?"
Everyone brings their own headphones. No transmitters, no receivers to rent, no noise complaints.
Bootcamps, beach sessions and park classes where a speaker isn't allowed — the class hears it, the neighbours don't.
Synced narration to a whole group without renting a hardware audio-guide kit.
Several phones, each on a cheap Bluetooth speaker, spread through a space — a distributed PA with no cabling.
A shared soundtrack outdoors, at whatever volume each person wants.
Only a trickle — enough to pass small timing messages. One bar of mobile data is plenty. If the connection drops entirely, playback continues; devices re-lock when it returns.
You provide it. MR Player plays audio files you upload — your own tracks, mixes and edits. There's no catalogue and no subscription.
No. Each device measures and compensates for its own audio output delay, including Bluetooth speakers and headphones.
A session is a group; large events can be split into separate rooms that each run their own set independently.
You supply your own files, so there's no streaming licence involved. For public events, the organiser is responsible for any public-performance rights that apply where they are.