ptzProxy setSpeed problem

Hello !

I'm controlling a ptz Camera with Player using the ptzProxy.
I want to do a speed controlling. I succeed to control the pan and the tilt
in speed but i can't do it with the zoom.
For the moment, I can only control the zoom in Position. 

My code is something like that : 

    ptz->SelectControlMode(PLAYER_PTZ_VELOCITY_CONTROL);
    ptz->SetSpeed(val1, val2, val3); 

Is there anything that I'm doing wrong ? Is there min-max value ?

Thank you.





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