You could do it with like an Arduino and any kind of button. There are tons of examples of using an Arduino to run a keyboard's firmware. Another project i've

You could do it with like an Arduino and any kind of button. There are tons of examples of using an Arduino to run a keyboard's firmware. Another project i've done was with a Rasberry pi. A benefit of that would be that the system is self contained. Their Python GPIO library is one of the easiest i've ever worked with and you could have it easily launch Chrome or Firefox programmatically and play audio without a monitor.