This was a strange discovery.
I discovered that my car, when AM is set to 540, picks up noise from acceleration.
The EMI is inverse to the pressure i put on the accelerator. Therefore, when i accelerate, the tone moves down.
This is a recording i made driving home from work. I used my ZOOM H4 with the built in stereo mic built in.
recorded at 48/24 encoded to flac.
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