XM (file format)
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XM, standing for "extended module", is an audio file type introduced by Triton's Fast Tracker 2. XM introduced multisampling-capable instruments with volume and panning envelopes, and basic sample compression. It also expanded the available effect commands and channels, added 16-bit sample support, and offered an alternate frequency table for portamentoes.
XM is a common format for many chiptunes.