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Their emotional states are usually monaural, offering only one channel of perception at a time.

Subtitled “The Expanded New York Studio Sessions,” the collection features nearly 85 minutes of previously unreleased recordings, as well as the otherwise unavailable monaural tapes of seminal Dolphy albums “Conversations” and “Iron Man.”

Nevertheless, while the quality of the “On Air” recordings varies considerably, and some are monaural while others are stereo, many sound remarkably crisp, clean and potent.

In 1967, George Martin and the Beatles spent the vast majority of their time focused on the monaural mix, which was still the dominant playback format in England at that time.

The auction includes the master tapes for the 26-song album as well as stereo mixes created from the original monaural recording and the 7-inch reel safety master from the original unedited tape that Barber made.