Interesting that she says you can let loose of the knob once the system starts making the different, more intense sound. We always learned to keep the system going until the system stops, after the different, more intense sound, not before. Because during the different sound the system is pumping up the system with extra pressure to keep the roof up (when opening), or putting the slot pins in place (when closing). So, always to wait until the system stops by itself so that these processes are duly finished, and NOT let go before...
That is also what the German video from Volkswagen says...
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