A real Doh! moment, for sure. The news keeps getting better all the time! BTW, the kind support crew at Festool sent me this reply, regarding the motor noise. I'm sure you folks know all of this already, but here goes...:
Different motors will act differently on different current, but generally the larger ones will act closer to ?normal?. In this case I presume your machine would sound the same here in the U.S. with 120v 60 Hz. I suspect what you are hearing is actually a feature of the saw that if you were not hearing, would mean there is something wrong with your saw.
Most of our products are equipped with what we call MMC Electronics. MMC is a robust electronic control board that has several functions from thermal and overload protection, to motor monitoring. A particularly strong feature with motor monitoring is the ability of the electronics to monitor performance and adjust speed through current regulation while at idle and under load. The benefit of this is to help maintain consistent tip speed under varying load. So as your feedrate may vary so will the load on the tool. The electronics are compensating for that. Also when cutting natural wood products, there is density variation throughout the piece that will affect load and the electronics will compensate for that.
To accomplish this ability, the electronics must monitor the speed at a frequency of 60 times a second (60 Hz.). Your machine may not be doing that optimally on your current; however, it will still do it.
So, in effect, what you are hearing is the backlash in the gears as the saw speed is constantly adjusted on the fly to keep tip speed at an optimum pace for the best cut performance.
What you are hearing is supposed to be there and is a normal sound associated with the tool.
[Got to love that "clattering" sound, eh?]