Maybe you can get some ideas from this...
This is the Moog Guitar patent: http://www.freepatentsonline.com/6216059.pdf
It's written on the back of the headstock, so it should be the right one:
http://www.moogmusic.com/forum/viewtopic.php?p=53143#p53143
After reading through it once, I still can't figure out how they can both drive and pick up the signal at the same place without losing part of the waveform when it switches from pickup to driver.
In this picture it looks like there's 12 connections coming from each pickup, so it's either two coils per string, or we are seeing both connections to the 6 coils. In that case, the 4 transistors per string may be an H-bridge to drive both ends of the coil instead of keeping one side grounded.
http://www.soundonsound.com/sos/mar09/imag...ogGuitar_02.jpg
