DDJ 400 + Rekordbox: Filter always disabled on startup

Hi,

i have the problem, that the filter in Rekordbox in the CFX Section is always disabled when i start the software. So when i turn the filter knob on my ddj 400, no effect is applied. I have to klick everytime after the startup of the software with the mouse on the filter button. Is this behavior normal. Because i have found no way to midi map the "cfx on" to an other button on the controller.

Thanks