The first feature film to be shown in multichannel sound. The original prints featured soundtracks that were recorded in a process known as Fantasound, a four-track directional stereophonic system that was invented especially to record the soundtrack for the film by RCA and the Walt Disney Studios technical team, led by William E. Garity. The Leopold Stokowski-conducted orchestra audio was recorded onto eight separate soundtracks (six channels recorded individual sections of the orchestra, the seventh recorded a mix of the first six channels and the eighth recorded a distant pickup of the entire orchestra), which were then mixed down to three tracks (left, center and right). The three music tracks were optically matted with a fourth control track (containing signal tones that varied the speaker dynamics) onto a filmstrip separate from the projector print. Over 90 speakers were used for the playback of the Fantasound audio during the premiere of the film on 12 November 1940. A more typical Fantasound setup used three speakers behind the screen and 65 others placed around the other three walls of the theater. However, Fantasound was discontinued due to the amount of sound equipment required and the time necessary to make the installation. The advent of wartime conditions also precluded the possibility of developing mobile units that could have lessened installation time and costs. Therefore, only 12 venues ever played the original Fantasound version of the film, and only 16 Fantasound-equipped prints were ever created. When RKO took over distribution for the roadshow version in January 1941, the film was shipped with a conventional monaural track. Disney technicians recreated Fantasound for the 50th Anniversary release in 1990 using modern digital technology and the original sound cues from the Disney archives, and this mix was encoded into the subsequent VHS and laserdisc releases. This mix is active, and even aggressive at times, with music swirling or jumping around the room. However, the DVD's mix sounds considerably different. While no official verification can be found that it was changed, the DVD's surround mix is more passive, with the music in the front channels and only concert-hall reverb in the rear channels. The sound is cleaner, but it is not Fantasound as it was described in 1940 and as it appeared in 1990.

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