1Song is a simple, microcontroller centered synthesizer module for generative (self-composing) music. It both composes the melodies and produces the audio itself, requiring no other modules to make music, but it also features inputs and outputs for timing which help it integrate with other modules in a modular synthesizer system. It can also be built in a stompbox style enclosure without these inputs and outputs and act as a standalone music producer, powered from a 9V battery or power adaptor.

This is for a PCB (including programmed microcontroller) only suitable for multiple formats.