captainbeefheart
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First we would need to define what is the "bad" kind and what is the "worse" kind. Then, and only then, could we progress to the next step. Jim
Well typically amplitude modulation is more pronounced.
When they studied the vibrato of a violin they found it contained both FM and AM. When testing circuits out for modulation effects to sound as close to real violin vibrato they found that the FM content was small and could be omitted and the AM was sufficient to create the desired effect. Test listeners said FM was dull and not as exciting as AM. Most all of the guitar vibrato/tremolo effects built into the circuitry is AM and it's very noticeable.