Pretty much what I'm trying to show from this is what you can do with Tracker programs. Modplug, Fasttracker, Madtracker, etc. He made that song with Modplug. He got these samples of actual instruments playing an individual note, looped it, and used the keyboard to play it. Here are the links to some of those programs. Modplug and Madtracker are Windows. Fasttracker is a dos program if I remember right.

Modplug http://www.modplug.com/modplug/download.php3?session=&download=Tracker

Madtracker http://www.madtracker.org/download.php?id=1

Fasttracker http://home.earthlink.net/~jmillan1/ft2/ft209.zip