[huhtenberg]

Whoopses shortly after a load with

    Uncaught Error: buffer is either not set or not loaded
        ti https://unpkg.com/tone@14.7.77:1
        start https://unpkg.com/tone@14.7.77:21
        triggerAttack https://unpkg.com/tone@14.7.77:21
        triggerAttack https://unpkg.com/tone@14.7.77:21
        processPianoState https://kevinzakka.github.io/robopianist-demo/examples/main.js:174
        render https://kevinzakka.github.io/robopianist-demo/examples/main.js:255
        onAnimationFrame https://kevinzakka.github.io/robopianist-demo/node_modules/three/build/three.module.js:27951
        onAnimationFrame https://kevinzakka.github.io/robopianist-demo/node_modules/three/build/three.module.js:12661

This is in a recent Firefox.

[rzzzt]

I needed to reload the page once and click on it to start. It might have to do with autoplay blocking.

[kzakka]

Indeed, browsers are pretty aggressive about not autoplaying sound, you need to interact with the screen (mouse click or finger tap + make sure your sound is up / ringer not on silent).