The tracks in Edition use the shorter MIDI versions (except they're recorded as WAV files either on authentic hardware or using soundfonts), however they play as if they were CD Audio tracks (i.e. Here's a comparison of the same track in both versions: The CD Audio versions of MIDI tracks are longer because they repeat their theme once and then fade out. The MIDI tracks were designed to loop indefinitely during a level, whereas the CD tracks played one after another. The WAV tracks in Edition are identical to the MIDI version of the soundtrack that was included with the DOS version (except for four tracks, two for each side, which were present in the CD Audio format but did not have MIDI counterparts). However, the music from Warcraft II has been performed with a live orchestra several times, such as this concert or this one. The DOS version credits make no mention of any orchestra, unlike the credits of Total Annihilation for example, which has a soundtrack that was recorded with a real orchestra. I heard they had a real orchestra playing the tune's back then.I think the CD Audio version of the soundtrack was synthesized, not recorded with a real orchestra.

Warcraft 2 battlenet edition