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The transcription of discs recorded by radio stations, principally the 16-inch variety type records were more often than not, had the second side recorded inside out; it is so that the equalisation alterations became less perceptible, as in "bass and treble", these changes were predominant with deteriorating treble response, but as the needle makes its way outward from the centre which, was for most occasions obvious on these early records. However, the frequency pitches of the acetate recordings is not distinguishable to the human ear on modern stereo lps!
Acetates are records that is more or less often recorded at 78-rpm speed, and are general, 10 inches in diameter, and they are recorded on primal home made disc recorders, which had been on widespread sale during the 1940s. Acetate records are of aluminium metal base coated with black lacquer and the recording stylus scores the groove whilst recording. In the sound system world of Jamaica, acetate records are known as "dub-plates!"