[anotheryou]

Does anyone know how well you can time via an app?

I wonder how it sounds to play sound across devices. Streaming and clock syncing can happen beforehand, just the playback has to be very sync to an absolute timing.

Maybe one can do something crude sound propagation synthesis by playing with timing, sound runtime, gps and a crowd. If you synthesize the sound the app even stays very small. You could e.g. make an ocean wave roll through the audience (when every device knows where it is and knows the exact time of when the wave will hit that position).

Same could work with devices as pixels, but I don't find it that interesting.

[asenna]

I'd gone to a hackathon a few years back (I think it was Michigan's MHack), and one of the teams did exactly that. It was actually really cool.

They split the room into 3 sections, and then controlled each section to play it's own tune.

[Normal_gaussian]

If you are playing sound you can use the microphone for synchronisation.

[anotheryou]

hehe, right, but it will get messy in a crowd. Maybe fun though, if the phones first try to agree on a timing.