Yes I have the same problem.
I posted about it but as seems the case with this forum nobody bothered to reply!
Hi all,
I have a problem with Sound Color FX selection.
Let's play : with my RX button, I enable Filter, then I switch to Noise, then go back to Filter... And Rekordbox DJ software stay on a Noise ! My Filter button is blinking on my RX, but the effect is not selected in the software.
I have try with my PC laptop (Win 10, last version of Rekordbox), and my Mac Mini (last OSX, last Rekordbox) : Same problem.
I have made an firmware update of my DDJ-RX : Problem always here.
The problem is present since the last update of Rekordbox, or maybe the previous one, I don't remember.
Please help !!
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Yes I have the same problem.
I posted about it but as seems the case with this forum nobody bothered to reply!
Can you open the FX panel and verify that the FX has switched, or did it stay as "NOISE" in the CFX box?

In the CFX Box, the FX stay as "NOISE"
Okay, to confirm -- the display of the CFX within rekordbox shows "NOISE" but the "FILTER" button is what's illuminated on the DDJ.
Can you please try opening the MIDI panel and click the RESET button at the top right, then try the CFX again?
Yes, the display Of the CFX shows « NOISE » but the « FILTER » button is blinking on the DDJ. And the working effect is « NOISE ».
It is the same after a Reset in the midi panel (the correct button is DEFAULT and bot RESET)
Thanks, I'll have to check this and pass it along to the rekordbox team for review.
Ok thanks a lot.
Hello, Problem always here... Any news ?
I have the same Problem :-(
Has this issue been solved? I still have this problem