An update. I tried today my BC for the first time with an active bass, a passive bass and a passive guitar, both being first in the signal chain and after other engaged pedals or buffers.
To my surprise... No clicky noise at all, not even with the passive instruments first in line. Not what I expected, believe me. And I mean, I really searched for this:
I tried then to trigger it somehow, and nothing. No clicks. Only beautiful compressed tones. The Tone + Colour options felt subtle and a bit underwhelming to me, but they are a nice option, nonetheless.
Curiously, I opened the back plate (stupidly tightened screws, by the way) to tweak the internal colour switches, and found the ribbon cable was yellow, exactly like the one used to substitute the white cable according to the Empress replacement guide.
Maybe the ribbon cable had already been replaced by the dealer? Who knows. Anyway, I'm gonna keep this one.