Editing FastTracker 2 (section)

=== Files ===
FastTracker 2 supports a variety of file formats, though often only two were used by musicians: [[XM (file format)|XM]] (Extended Module) and XI (Extended Instrument). XM was and still is one of the most popular module formats nowadays, because of its compact and well compressible file structure.

MOD format supported 4 channels maximum in a song, XM format, 32 channels maximum in a song, though there could be multiple instrument on one channel. ( from Channel n°0 to channel n°31 )

Some players — such as [[ModPlug Player]] — support the zip-compressed .XMZ and .MDZ formats, which are simple [[ZIP (file format)|ZIP]] archives that contain a .XM or .MOD file respectively.

The [[Adaptive differential pulse-code modulation|ADPCM]]-compressed XM extension is an XM subformat introduced in [[ModPlug Player|ModPlug tracker and player]]. It has the same XM file format structure, except that at least one of the samples is compressed in 4-bit ADPCM format. An ADPCM-compressed sample is almost two times smaller than its uncompressed equivalent. The drawback is the sound quality – significant distortion may arise when using ADPCM.<ref name="ufmod">{{cite web|author=Quantum|publisher=uFMOD|date=2007|title=The Unofficial XM File Format Specification: FastTracker II, ADPCM and Stripped Module Subformats|url=https://sourceforge.net/projects/ufmod/files/XM%20file%20format%20specification/XM_file_format.pdf}}</ref>

Another known extension is OXM – [[Vorbis]]-compressed XM. It preserves the original XM file structure, except the samples, which are compressed using the Vorbis codec.<ref name="ufmod" />

The Stripped XM file format is another XM subformat. It was introduced in [[uFMOD]] in 2006. A Stripped XM file is smaller than a regular XM, because it uses a more compact set of headers. The audio content of the XM file is left untouched.<ref name="ufmod" />

Even more non-standard XM extensions exist. For example, some trackers introduce undocumented effect commands used as triggers for software events, [[Speech synthesis|Text2Speech (TTS)]] metadata, watermarks and so on.<ref name="ufmod" />