Why does this conditional operation not work?

I have a Fader object and its midi input and output are disabled. Then I create a script "On Expression, Fade.x" to get feedback to the fader from a hardware midi controller sending pitchbend:

midiout(1,{224,1,Fader.x*127});

This works! Then I create a script"On Midi, Pitchbend, Channel 1" to output midi pitchbend:

setexpression(Fader,'x',MIDI_ARGS[0]/16000);

Ok, now I get midi output from the Fader in Lemur. However, I also get doubled midi output from feedback sent to the fader, which is not how I want it. Well, this is why I created the condition in the first script:

if(Fader.z>0) midiout(1,{224,1,Fader.x*127});

This should theoretically only send the mid out, as long as I touch the fader. But instead, the midi gets sent out anyway ... I don't understand why?!

not sure about that, but I would think that if you add the line

else return

it should work as you want.

Thanks for trying! Actually, that line is not necessary with any other conditional expressions.
But I tried it anyway. It didn't help ... I can't figure out why ... it seems so obvious it must work!

I think I figured it out: With every Midicommand triggering the Fader.x value via script, the fader automatically sends a Fader.z=1 value. SO, it seems, there is no way to trigger a fader or knob without triggering touch with it, although you actually did not touch the fader ...
Bad news ...