sequencer

from WordNet (r) 3.0 (2006)

sequencer
    n 1: (chemistry) an apparatus that can determine the sequence of
         monomers in a polymer [syn: {sequencer}, {sequenator}]
    2: computer hardware that sorts data or programs into a
       predetermined sequence

from The Free On-line Dictionary of Computing (8 July 2008)

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)