tracker

noun

1. 1.Agent noun of track; one who, or that which, tracks or pursues, as a man or dog that follows game.
2. 2.In an organ, a light strip of wood connecting (in path) a key and a pallet, to communicate motion by pulling.
3. 3.A type of computer software for composing music by aligning samples on parallel timelines.
4. 4.A musician who writes music in a tracker.
5. 5.A computer program that monitors something.