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In page Switched-On Bach:

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Switched-On Bach was released with two different covers. The most common features a man dressed as Bach standing before a Moog synthesizer. Early pressings feature the same man seated. Carlos and Elkind objected to the original cover and had it replaced, finding it "was a clownish, trivializing image of a mugging Bach, supposedly hearing some absurd sound from his earphones". They also objected to the fact that the synthesizer was incorrectly set up: "[The earphones] were plugged into the input, not output, of a 914 filter module, which in turn was connected to nothing, [assuring] that silence is all that would have greeted Johann Sebastian's ears."[1]