Noun

1. One who, or that which, tracks or pursues, as a man or dog that follows game.
2. In the organ, a light strip of wood connecting (in path) a key and a pallet, to communicate motion by pulling.
3. A type of computer software for composing music by aligning samples on parallel timelines.
   • 2008, Karen Collins, Game sound

     Although there were a few game companies outside the Amiga scene that used a tracker format (Epic Mega-Games, for instance), the majority used the better-supported MIDI.

4. A musician who writes music in a tracker.
5. A computer program that monitors something.
6. Server software that coordinates peers in the BitTorrent protocol.