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I assembled a poly555 from oskitone.com :D
It's an analog polyphonic square wave synthesizer. This means no code involved, it can produce multiple note at once and it make kinda harsh sound.
The case is 3D printed plus a piece of plexiglas and half a dozen nuts and bolts. The plexiglas expose the twenty 555 timer circuits and their led showing which ones are playing, What's not visible is the voltage regulator for the 9v battery and the amplifier for the speaker under the grid,

Photo of a yellow poly555, an analog polyphonique synthesizer. Visually it's a rectangle 16cm high and 20cm wide with 3 distinct area. The bottom part have 20 keys with white and black, like a piano. The upper left part which take a bit more than two third is a transparent panel exposing a pcb with 20 groups of component in a grid of 4 row and 5 columns. Each group is a 555 timer, producing a note when the matching key is pressed. Each timer also have a led, green for white keys and red for black keys. The upper right is a grid for the speaker and is part of the case. The case is yellow and 3D printed, giving it a texture specific to FDM

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