FamiTracker Instrument File
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What is an FTI file?
Instrument file used by FamiTracker, a music creation program designed for creating music for the original Nintendo Entertainment System (NES); contains instrument properties, such as volume, pitch, and arpeggio settings. Referenced when playing back the corresponding sample (such as a .DMC file) within a FamiTracker song.
Since most FTI files contain only instrument properties, they are typically only a few kilobytes in size. The sample files that contain the actual audio data are much larger. FTI files are typically saved alongside FamiTracker song (.FTM) files.