It was released on Quadraphonic 8-track tape and CD-4 LP. The entire album was also remixed for 4-channel quadraphonic sound. The album was also originally released in 4-channel quadraphonic. Stereo and quadraphonic mixes of the album were released. This edition contains both stereo and quadraphonic mixes. The album was a standard recording but available in two formats&colon; quadraphonic and stereo. This album was mixed and released in both stereo and quadraphonic. Some shows were recorded and mixed in both stereo and quadraphonic. The album was mixed and released in both stereo and quadraphonic. This album has been mixed and released in stereo and quadraphonic. It has been mixed and released in both stereo and quadraphonic. In 1970, Studio A became the first recording studio designed for mixing quadraphonic sound. His concerts incorporate quadraphonic sound and elaborate visuals. The original quadraphonic mix remains unreleased. This is the first album by the Eagles to be released in Quadraphonic surround sound.