S3M

S3M is a file format used for storing music, primarily associated with tracker software. It was developed by Darius Gajewski, often known by his handle "Raptor," and gained popularity in the demoscene and among early computer musicians. The format is an evolution of earlier tracker formats like MOD and XM, offering expanded capabilities for sound manipulation and instrument storage.

The S3M file contains digitized audio samples, musical notes, and instrument data. These notes are arranged in a grid-like pattern, representing sequences and effects over time. The format supports a variety of audio effects, including vibrato, arpeggio, and panning, allowing for complex musical arrangements within the limitations of the hardware at the time of its creation. S3M files are typically played back using specialized tracker software or emulators that can interpret the data and synthesize the music. While less common today than more modern audio formats, S3M remains a significant part of retro computing and chiptune music history.