That's what I gathered from some of the other posts. I only started to notice it now that I'm home more and trying to play quietly through the speakers.
I rewatched a video I took when I first got it and that noise is there. For some reason it didn't bother me until recently. It must be like fridge buzz. Once you notice it, you can't unhear it.
But again, I love my CTX. I still can't believe the sounds I can get out of this for the price point. A little key clacking is a minor tradeoff 😆