Random(ish) noises from M5Stack Unit Synth-Midi

Trying to figure this out - and making the Unit Synth Midi make random noises. I'm not even going to pretend that I know what I am doing. Or that I understand this at all. Also I don't know anything at all about MIDI, I was just hoping to use this to make random "robotic" sounds (R2D2 style)