Steps
- Connect the keyboard to your computer with a USB cable (some keyboards need a USB-MIDI adapter).
- Open MIDI.PLAY in Chrome, Edge or Firefox.
- When the browser asks whether the site may use your MIDI devices, allow it.
- Open Settings → Keys and choose your keyboard.
- Press a key. It lights up on screen.
It isn't working
- Safari doesn't support MIDI keyboards. Use Chrome, Edge or Firefox instead.
- Nothing in the list? Unplug the keyboard, plug it back in, and reload the page.
- You blocked the permission by accident? Click the icon at the left of the address bar, allow MIDI devices, and reload.