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A related question... I have often noticed that when cylinders are played on Edison machines or other acoustic cylinder players, they have a rapid vibrato (or tremolo...whichever is a change in level rather than frequency) which makes them sound like they are being played under water. What causes this...and is it caused by the record or the machine? I assume that they didn't sound like this when they (cylinders and phonographs) were new, or else they wouldn't have sold very well...am I right? Steven C. Barr