Re: David Krall's note in yesterday's 120925 MMD to sell an Aeolian
Hammond Player Organ equipped with "vibrato rather than the usual
tremolo that Aeolian Hammonds usually had."

What is the difference between "vibrato" and "tremolo"?

Phil Jamison

 [ The engineer's simple definition is that vibrato results from
 [ frequency or phase modulation of the waveform, and tremolo is
 [ amplitude modulation of the wave.  Amplitude modulation of an
 [ audio signal is easily applied, but for many years the only
 [ effective phase modulation system was the spinning loudspeakers
 [ developed by Don Leslie.  I don't know how the terms are used
 [ on the Hammond and other electronic organs.  -- Robbie