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The Providence ABC-1 is an analog chorus with Bucket Brigade Device. The signal is passed on to the next unit in multiple stages and therefore delays. Hence the name, just like the bucket brigade forming a chain while extinguishing fires. The bucket is passed from one to the other and hear and there a bit of spillage and loss occurs.
This means that the frequency response of the signal thereby deteriorates from stage to stage, but that's what creates the typical warm analog sound and makes the effect characterized as well as charming.
