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Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   sequencer
      <music> Any system for recording and/or playback of music via
      a programmable memory which stores music not as audio data,
      but as some representation of notes.  The most common modern
      usage of "sequencer" is to refer to systems (whether in
      software, or as a feature of devices like synthesizers or drum
      machines) that deal with MIDI data.
      (1999-06-04)