tracker

jäljittäjä (n-g); one who, or that which, tracks or pursues, as a man or dog that follows game.
In an organ, a light strip of wood connecting (in path) a key and a pallet, to communicate motion by pulling.
puhekieltä A type of computer software for compose composing music by aligning samples on parallel timelines.
2004, "dilvie", new.scene.org (on newsgroup alt.music.mods)

Trackers have broken out of the demoscene, are are(SI) now in use by thousands of professional musicians. It's not uncommon to hear about people using trackers on DJ forums, and electronic music production communities(..)

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.

You can always find musicians. There are more trackers than coders, pixelers, organizers, couriers, and designers combined.