I like the sound of the flute
THinst sound font, actually, a lot of the sounds sound like they come from there, lemme see if i can get you to a download page...
edit: some of the sounds come from it
Is it a mellotron flute? It sounds mellotrony to me
The flute is from a soundfont called Crisis General MIDI 1.8
(source: i was the one who put that instrument into online sequencer)