Preset A04-1BD / Effect is wandering

I’m taking a closer look at the presets to learn from them.
I came across a “phenomenon” that I can’t explain. It is about the preset A04, here the track 1 BD.
It is a kick consisting of synth and samlple.
You can hear a delay and reverb. In a distance that is a bit longer than the pattern, the reverb or the delay stops for a short moment. This effect “wanders”, so to speak, further and further back. How do you program something like this?

no one has an idea?

Are you talking patterns or sounds? Check the fx track. Remember the fx track has trigs and an lfo as well