Where the Filter Really Cuts
The cutoff dial on a synth is only telling the truth at one setting of the resonance dial. Turn the resonance to 2 and a cutoff reading 1,000 Hz cuts at 1,485. Measured off the filter, not the diagram.
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The cutoff dial on a synth is only telling the truth at one setting of the resonance dial. Turn the resonance to 2 and a cutoff reading 1,000 Hz cuts at 1,485. Measured off the filter, not the diagram.

How long a glass rings and how narrowly it listens are the same number. Measure it both ways and they agree, unless you sweep past it too fast, and then one of them is 64% wrong.

Two speakers playing the same note fill a room with fixed lines of silence. Pace out the gaps between them and you have measured the speed of sound without timing anything.