From the Every Good Boy Deserves Favour quadraphonic reel to reel tape, the first mix is front and back channels together, second is front channel and last is rear channel.
The Story In Your Eyes (4.0 quad, front/rear channel mixes): The Moody Blues
From the Every Good Boy Deserves Favour quadraphonic reel to reel tape, the first mix is front and back channels together, second is front channel and...