translationTable issue with cc

Question

If I use translationTable in labeled-knob it works as expected:

<labeled-knob x="200" y="60" label="Group 1" type="float" minValue="0" maxValue="1" textColor="FF000000" value="0.5">

   <binding type="amp" level="group" position="0" parameter="AMP_VOLUME" translation="table" translationTable="0,0;0.5,0;1,1" />

</labeled-knob>

the volume start to increase only at middle course.

BUT if I try to do the same with CC2:

<midi>
      <cc number="2">
        <binding type="amp" level="group" position="0" parameter="AMP_VOLUME" translation="table" translationTable="0,0;0.5,0;1,1"/>

</cc>

</midi>

it does not work at all. the volume imediately goes to the max when the cc is around 4 or 5.

it seems that the cc value is not properly mapped to the range [0,1] before entering in the translation table.