I tried to post some code:
<control x="00" y="-2" parameterName="Pan" type="float" minValue="-100.0" maxValue="100.0" value="0.0" trackForegroundColor="CF77FF77" trackBackgroundColor="CF000000" width="50" height="50" style="linear_horizontal">
<binding type="amp" level="group" identifier="0" parameter="PAN" />
<binding type="amp" level="group" identifier="1" parameter="PAN" />
<binding type="amp" level="group" identifier="2" parameter="PAN" />
And my question did not appear... so I'm testing it again...