Are you playing with a slide? If you just fret a single note with all other strings muted, do you still hear this?
There are a few things this could be:
pickup height is too close to strings?
Interaction between the power station and the amp or speaker; basically anything with a magnetic field could be coupling with each other. Try to maximise the distance between PS-2, the amp, and the speaker.
OK good. Do you notice an increase in background hum in Operate mode when not playing anything? I didn’t hear anything in the vid, but that’s not always definitive.