On one side there is a dry signal coming from a microphone, on the other side a magnetic pick-up going into a reverb pedal. These signal goes in the camera thru a spartan location mixer which have nothing in term of control except gain, volume and a high pass filter that I don't use. Depending on the notes, the response of each channel can be different. There is no "magic" software involved. But the result is putting at work a known psycho-acoustic effect created by the brain, which creates a pleasant result. Very simple stuff. No technology at all.
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