A few years ago I made a digital audio-guide for an interactive exhibition in the form of a Progressive Web App, using a modified version of Quiet.js[0] for pro

A few years ago I made a digital audio-guide for an interactive exhibition in the form of a Progressive Web App, using a modified version of Quiet.js[0] for proximity, e.g. You enter a room, the phone mic picks up a signal playing in this room and starts an audio track synced with video projected in the room. Screenshots of the app: https://pino.ceniccola.it/portfolio/img/diconodilei-1.jpg https://pino.ceniccola.it/portfolio/img/diconodilei-1.jpg https://pino.ceniccola.it/portfolio/img/diconodilei-4.jpg https://pino.ceniccola.it/portfolio/img/diconodilei-4.jpg Sadly, Safari iOS Web Audio API filtered out everything above ~16khz, so instead of playing the audio at full volume in the room I had to make a few points of contact where you had to place your phone near enough a little speaker (actually a tweeter) to pick the (now) audible whisper but at much lower volume. By the way, everyone was already wearing their headphones anyway, and it worked like a charm with many people wondering what and how was going on! [0]: https://github.com/quiet/quiet-js https://github.com/quiet/quiet-js