Tremolo is derived from "Tremble Low," which is what Leo Fender named it on his 50s open back Bassman amps. He thought the added throbbing and rumbling effect would take his electric bass guitar to another level.
Leo didn't always get it right the first time, and the early Bassman 4x10 combo amps with Tremble Low would shake and tremble so much that they fell apart. NONE survived. So Leo omitted Tremble Low on subsequent Bassman combos.
I'd heard it was removed because law enforcement wanted to use Tremble-Low (tm) to produce the brown note for crowd control. Fender had to leave Fender to get out of that contract as he was hip with the revolting hippies and not square, man. Tremble-Low on a Fender Twin never got down to those brown note frequencies, so the government let Fender keep putting those out.
But just you wait until hear how the Tube Screamer was really designed by the CIA as a mind control system, though...
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