One way to hold modulate: a hand resting on a dial, not on a switch. The thing is already running — a voice, a treatment, a piece of music, a radio wave — and the hand keeps turning the dial to set how much: a little higher, a little softer, a little slower. Nothing is switched off and nothing is swapped for something else. The level is being shaped while it runs, and the shaping follows a measure rather than a , which is why a modulated voice or a modulated signal sounds controlled rather than random.
From the word’s history
The evidence packet's Wiktionary entry traces modulate to Latin modulor (to measure, regulate, modulate) plus -ate, from modulus (measure). The literal idea is to set something by a measure, which sits directly under the modern uses: the word is about adjusting to the right amount, not about replacing or switching off.
供給的 Wiktionary 條目說 modulate 來自拉丁文 modulor（量測、調節）加上 -ate，而 modulor 又來自 modulus（尺度、量度）。字面上就是「照著一個尺度去調」。這正好說明為什麼今天的 modulate 講的是把東西調到合適的程度，而不是換掉或關掉。同一條目也提醒 module、modulus 是同一家的字。
Wiktionary entry supplied in the evidence packet (source_ref kaikki:3f6f69a190036ae4:902451458:21930): From Latin modulor (to measure, regulate, modulate) + -ate, from modulus (measure). Compare module, modulus.
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