Sebastian made a hardware-only (no microcontroller) drum machine –

I wanted to make a device that plays back digital audio, without the use of any programming or a microcontroller or a computer. In other words, the most basic rompler, as a hardware-only device.

Rompler-Bboard

I’m continually impressed by the complex breadboarding I see in projects like this – that many jumper wires require a delicate touch and a very special kind of patience! – A True Rompler(2) Drum Machine