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Lars,
The noise you hear is generated by PWM (Sawtooth waveform current, flowing in motor coils), that is why the change in sound was not significant..
However, what you will find is the significantly smoother tracking, because you removed the transfer gears, so the only potential issue for PE and un-even moving remained will be the worm and worm gear.
In case you need/want to improve that, you will have to lap it with diamond paste (available on ebay for couple of $$).
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