I've seen pictures of AB1s with and without a small switch near the bridge. I understand that the knobs are Volume / Pickup Selector / Tone (blueEQube). What does the switch do??
I think that the electronics on the ABs have gone through a coupkle of iterations. on mine (AB-I) the switch is the blueEQube, sort of a passive mid scoop switch. I find it pretty useful.

