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MUS

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The MUS format is a slightly altered MIDI format used in the Doom engine soundtracks. MUS files are nearly identical to MIDI files, only slightly more compact. The file format has a size limit of 65536 bytes.

Support for standard MIDI files in Vanilla Doom was added in version 1.5, which meant WAD authors no longer needed to convert MIDI files to MUS.

Limitations

The MUS format can only use the first 9 MIDI channels; using the first 8 for melodic instruments and the 9th for drums. The reason this is forced upon the format is that older soundcards had an FM sound chip with only 9 FM channels. Although some at the time had 18 channels, these were less common.

Notes

The MIDI2MUS converter does not create perfect conversions; sometimes the created files can sound distorted.

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