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 film strip 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 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 at times. However, the DVDs mix sounds considerably  different. While this author can find no official verification that  it was changed, the DVDs surround mix is more passive, with the  music in the front channels and only concert