What is an S3I file? An S3I file is an instrument used by Scream Tracker 3, a DOS-based music tracker program popular in the 1990s. It stores instrument data, including sound samples and the associated parameters, such as pitch, volume, and effects settings, that alter sounds in compositions.

More Information Future Crew developed Scream Tracker, releasing the first version in the 1980s, and version 3, which introduced the S3I format, in 1994. The program allowed musicians to arrange music in a step-based format, manipulating samples for detailed control over sound production. Although Scream Tracker 3 is discontinued (Future Crew ended development after releasing 3.21), and the S3I format is largely obsolete today, some retro music enthusiasts still use S3I files when creating music.