Remember the Mellotron? It was keyboard built in the 60’s which played tape loops of samples like strings, voices etc. The machine would roll a tape loop and vary the speed of the tape depending on the pitch of the key played. They sounded very cool on old Beatles and Genesis albums.
Here’s a modern day version of the Mellotron. All those tiny little black items are individual walkmans. Very cool.
Here’s the guy’s site: http://mysterycircuits.com/melloman/melloman.html