Controlling slider from presetEffects.xml

Hi

I have a script which adds a slider to a null using the presetEffects.xml.

<Effect matchname="controls" name="$$$/AE/Preset/Controls=Controls">

      <Slider name="$$$/AE/Preset/PositionX=Position X" default="100" valid_min="-100000000" valid_max="100000000" slider_min="-1000" slider_max="1000" precision="1"/>

  </Effect>

This works as it is supposed to. Problem is, when I "slide" it. Hower draging with mouse. It will jump with increments of 10. I would like it to slide with increments of 1.

If I add a slider control manually inside after effects, it slides by increments of 1.

Anybody know how to set this?

Thanks,

Jakob