Editing Id Software (section)

==== IMF Music File Format ====
IMF ("id music file" or "id's music format") is an [[audio file format]] created by id Software for the [[AdLib]] [[sound card]] for use in their video games.<ref>{{Cite web |title=IMF Format |url=https://moddingwiki.shikadi.net/wiki/IMF_Format |access-date=6 October 2023}}</ref> The format is similar to [[Musical Instrument Digital Interface|MIDI]], in that it defines musical notes, and does not support [[sampling (music)|sample]]d [[digital audio]] for sound effects. IMF files store the actual bytes sent to the AdLib's [[Yamaha YM3812|OPL2]] chip, which uses [[frequency modulation synthesis|FM synthesis]] to produce audio output. The format is based on the AdLib command syntax, with a few modifications. Due to the limited features and relatively low sound quality, modern games no longer use IMF music.

A large number of songs in id Software's early games (such as ''Commander Keen'' and ''Wolfenstein 3D'') were composed by [[Robert Prince (video game composer)|Bobby Prince]] in IMF format. Other game developers like [[3D Realms|Apogee Software]] also used this format in their games (such as ''[[Cosmo's Cosmic Adventure]]'', ''[[Duke Nukem II]]'', and ''[[Monster Bash]]'').