From Tsvetozar Drambozov:
SF2 Splitter is a simple tool that extracts instruments from SoundFont files and saves them to separate SoundFont files. Each new SoundFont file contains only one instrument from the original SoundFont file that has been split. Hence the name - SF2 Splitter (SF2 is the file extension of the SoundFont 2.0 file format). SF2 Splitter is based on Creative's SoundFont SDK and uses its API interfaces to access the SoundFont file handling functions.