Final answer:
The Melotron keyboard creates sound by playing pre-recorded tape loops corresponding to individual notes of various instruments, such as the flute sound in 'Strawberry Fields Forever' by The Beatles.
Step-by-step explanation:
The Melotron keyboard is a unique musical instrument that produces sound by triggering a series of tape recordings. Each key on the Melotron corresponds to a pre-recorded tape loop of an actual instrument playing a single note. When a key is pressed, the tape loop is played, creating the sound of the actual instrument. This is how the famous flute choir sound in The Beatles' 'Strawberry Fields Forever' was produced. The Melotron was able to replicate the sound of many different instruments, such as string sections, brass, voice choirs, and other sounds that otherwise would be challenging to incorporate into pop music recordings of that era.
Despite not dealing directly with resonance and beats like some traditional instruments, which produce sound via vibrations in a resonant cavity or strings, the Melotron's tapes contain recordings of instruments that have been produced using these principles. The ‘flute’ sound in The Beatles' song is a direct capture of a flute's resonant sound, replicated via the playing of the tape loop on the Melotron when a key is struck.