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File Formats: MUS

xmeadow edited this page Mar 13, 2026 · 1 revision

MUS (Music) Format

Notes by Aaron Bishop (Dunlar)

About 3840 notes in a 3 minute track. About 30k excluding samples.

Layout

Field Size Notes
Header string 16 bytes e.g. "32 INSTRUMENTS " (up to 256 instruments)
For each instrument:
Sound file name 8 bytes e.g. "_DRUM4 "
Null terminator 1 byte
Tempo 1 byte Instrument 0 only
Intro time 1 byte Instrument 0 only
Fade out time 1 byte For looped instruments (FF = infinite loop, only done first time through file)
Loop start 3 bytes For looped instruments
Note count string 16 bytes e.g. "810 NOTES "
For each note (in play order):
Time 2 bytes In units of 1/4096 sec
Duration 2 bytes In units of 1/4096 sec
Instrument 1 byte
Volume 1 byte
Pitch 1 byte
Pan 1 byte

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