Tsk, tsk, Robbie -- Ya got it bass-ackwards! Tremolo is AM (amplitude
modulation) whilst vibrato is FM (frequency modulation).
Regarding the Mills Violano vibrato, I know very little about these
instruments, but as to whether the frequency varies above or below,
or both, about a centre frequency can be easily checked with a strobe
or equivalent. It could very well be that the tuning weights may
bounce a little under the influence of the shaking action of the
vibrato mechanism causing the pitch to both rise and fall at the
vibrato rate.
Jim Heyworth,
Sechelt, B.C., Canada
mailto:james_heyworth@sunshine.net
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