https://www.youtube.com/watch?v=_RyodnisVvU https://www.youtube.com/watch?v=_RyodnisVvU Description here: https://www.robotshop.com/community/forum/t/yellow-dr

https://www.youtube.com/watch?v=_RyodnisVvU https://www.youtube.com/watch?v=_RyodnisVvU Description here: https://www.robotshop.com/community/forum/t/yellow-drum-machine/447 https://www.robotshop.com/community/forum/t/yellow-drum-mach... Although it doesn't seem made using LEGO Mindstorms, I'm sure that is the one you mention; it was quite successful at the time among robot building aficionados.