| "Growl" is a term for a sound that is specifically produced by Jazz basses - although not necessarily Fender.
Jazz bass "growl" was known amongst bassists for many years in the 70s and 80s onwards - it is only recently that "growl" has been adopted as a more generic term - to mean soemthing compltley different!
But if I had said 'growl' in 1976, it would have only had one meaning to a bass guitar player.
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“Making the simple complicated is commonplace; making the complicated simple, awesomely simple, that's creativity.”
Charles Mingus | 
