That particular AFD-45 belongs to me now.
It really has sophisticated electronics, on which I'd like to shed some light here. I hope you guys are interested.
First of all, it has 3 Ultrasonic REF2 pickups. The Ultrasonics are a piece of pickup making history yet not widely known. According to what I found out, the original series was manufactured by the OBL/Bill Lawrence company in Germany in 1985/1986. The Ultrasonic distributor went out of business after a very short period of time and the pickups were sold off very cheaply. I have seen these pickups on late 80's Tom Anderson, Zion, Valley Arts and Lake Placid guitars as well as on some custom luthier efforts. They are passive pickups with pronounced linearity over the frequency, allegedly highly suitable for heavy effects processing -- like a "passive EMG"-type pickup. The REF2 model used on the AFD-45 is a stacked humbucker, and each of the three pickups is mounted and wired separately.
Here are the electronics: (pretty complicated wiring!)
1x volume pot
1x tone pot
1x 3-way mini switch for pickup selection
1x mini switch for coil-tapping neck pickup
1x mini switch for activating active boost circuit
1x 6-way rotary switch for even more pickup selection and coil-splitting
The active boost circuit has a separate battery compartment, its cover is mounted by threaded screws (a neat detail). The gain can be adjusted by a small trim pot inside the electronics cavity, accessible with a screwdriver through a hole in the cavity cover. I will try to find out if it has a "flat" frequency response or if there is some midrange boost involved.