Disappearing ActAll-Analog Ducking Spring Reverb

From the vendor

Who doesn't love the glorious wash of a spring reverb after hitting a big chord? The only issue with it is that the wash can also turn the attack of new notes to mush, making it hard to get any real definition of the notes being played. That can be desirable at times, but other times you want that big wash of reverb on the tails of the notes but a more present, dry attack. The Disappearing Act allows for precisely this. It's an all-analog spring reverb driver circuit with an envelope follower and optical compression of the reverb signal so that you can dial in just the right amount of detail for new notes while allowing the wash of a heavy reverb to fill the space between notes.

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Ducking of effects using a sidechain input is a common studio technique that allows key signals to be more forward in the mix. It gets used on vocals, snares, kick drums, and more all the time. However, this