Karsten Obarski (handle
Obi) was a German composer at reLINE Software, a video game development company. Karsten is most famous for writing the
first tracker for the Amiga, the Ultimate Soundtracker. Later famous trackers such as ProTracker are based on Ultimate Soundtracker's interface and file format. Soundtracker is a piece of software that allowed for
four-channel hardware mixing on all Amiga computers.