Left screen is me bullying an AI in a themed terminal. Just for fun. Virtual midi keyboard (glad you asked) is yoshimi, which assigns the keys automatically to your keyboard. I was actually playing along to some music [playing in cmus] using a 25 key midi sampler. The virtual keyboard shows me which key is being pressed [a blue dot appears on the relevant key]
https://yoshimi.github.io/docs/user-guide/starting/starting.html You know what, install yoshimi and use it. It's great fun.