I've been having the same problem with my Superb for some time.
Tried taking it all the way to the front and then to the back, but that did not help.
But after reading this thread, and the thread at the other forum, I got it working (thanks folks). :-)
I did this with ignition on, but engine not running(one push at start button without foot on brake).
First I maxed the seat upwards/forwards, (seat all up and forward, and the seat-back tilted all the way forward)
Then I maxed the seat all the way down before maxing it all the way to the back, and got the magical two bongs!
I was going to tilt the seat-back all the way back as well, but I think it would have been enough to only move the seat itself to it's max-backwards position.