I have a recurring dream where I will hear this melody playing over and over again. But it is a monophonic sort of dirty triangle wave sound. I have had the same dream for years!

Not long ago I was randomly watching a video of old toys from the 80s and the guy hit the demo button on an old Casio and the tune played exactly like my dream.. lol so I have had that classic Casio sound in my head for most of my life. I definitely had that keyboard.

EDIT: It turns out it wasn't a Casio that I was remember. It was a Mattel Bee-Gees Rhythm machine. Although I did own many Casio keyboards. I am actually going to write a post about it.