There is a sound generator in the Scirroco 170 diesel but it does not appear to be 'switchable'.
I quote - 'The sound device doesn't show up in Vcds/vagcomm, but it is connected to the can-bus.
The only way to turn it off is to disconnect the transducer.
It's definitely an artificial noise - there's a noise generator/control unit, and the transducer/speaker device.'
In the ROC it is under the plastic trim under the wipers.
Cannot understand why VW want to make a car noisier! Best of luck turning it off.