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the predelay calculation has some affects on the early reflection patterns. This is what makes some of the models sound the way they do.
So when you change the predelay the reflection model is muted to stop clicks, hence no reverb for a short period. We will assess the click factor apon predelay change, some fx units click when you change reflection model. If we had done it the other way you would be mentioning the clicks !

The gated reverb does not have the same reflection model relationship and predelay changes do not click and are silent. Although some gated reverbs do click apon predelay change – maybe you want the annoying click ;>)

other people have mentioned it on the channel delay too. We are investigating this.