H-Reverb Ducking question

I just bought the H-Reverb, but Im not sure about the ducking function, what it actually does. The manual basically sais that it ‘ducks’, but listening to what it does, Im not sure if it the same as what I learned what ducking is.
For me ducking means that a compressor lowers the volume when a new signal is detected, but when I activate the ducking function of the H-Reverb, I hear the first part of the reverb get significantly louder, like its boosting the input gain.
Anyone who can shine some light on this?

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