KromiOS makes its own disk sounds: the click and clunk of a card going in and out, and a drive's hum and head steps while the card is read or written. No recordings: the system makes them itself. Settings › Sound switches them on and off.

When an app on KromiOS stops answering for five seconds, its window gets a light veil and says "Not responding". Everything else keeps running. Ctrl+Alt+Escape opens Running apps from anywhere, and it tells you what an app hasn't saved before you end it.
This is KromiOS, Kromi One's own simple, extendable OS. Its Terminal is a shell in the AmigaOS tradition: RAM: and assigns, command templates, tabs, completion, a Lua console, and Lua scripts as commands. A 1920 × 1080 screenshot from the emulator.