Oh, didn't you hear?
This is a simple circuit bent little toy
- it was literally just a case of replacing resistors for pots.
It plays Old Macdonald Has a Farm until you are sick of it and you cannot get it out of your head.
It looks like this inside:
And it looks like this on the outside:
*Note Sugru finished knobs
And it sounds like this:
It gets pretty annoying after a while, only having the one song.
Next time - more variety.