(Module): a file type that contains a mixture of MIDI sequencing and audio sample playback data. A .MOD file has the MIDI sequencing information for the MIDI instruments, and audio information in the form of short ‘samples’ of audio. These samples can be looked upon as short digital audio files of short passages (loops) or notes of an instrument. It is up to the MOD composer to determine what samples are included in the .MOD file. Therefore .MOD files can sound the same on any computer and won’t be limited to the instruments and effects that are built into the sound card. On the other hand, the number of samples you can put in a .MOD file is limited and changes are less easy to make. The size of MOD files is larger than regular MIDI files, because audio samples are included and good samples require more data. However, .MOD files tend to be significantly smaller in size than .WAVs or AIFFs.