Warner Bros. Records issued the soundtrack album in both stereophonic and monaural versions. Musical numbers were recorded in stereophonic sound, but released to theaters with conventional monaural sound. This began a practice of simultaneously recording orchestras with both stereophonic and monaural equipment. Single-earpiece headsets are known as monaural headsets. Both monaural (10%) and binaural cells (90%) exist in the MGN. The FM modulation and demodulation process is identical in stereo and monaural processes. The monaural audio track was remastered without compression. The first theatrical run featured four-track Dolby Stereo sound, while later runs featured monaural sound. The recording was issued in both stereo (DOS 687) and monaural (DOL 287) formats. Depending on the specific mixer, each channel is stereo or monaural. Stereo recordings often cannot be played on monaural systems without a significant loss of fidelity. He is also credited for devising a technique transferring monaural sound to stereo. The audio track effectively becomes monaural. Standard headphones could also be connected to a monaural jack. Where two catalogue numbers are given, the album was released in monaural and stereo versions.