I forgot to paste the link:
http://www.kramerforum.com/wiring/sustainer.html
I´ve been reading the manuals for the FS101 from Frenandes Guitars, and the PCboard looks quite complicated, if you want to see how it looks like, go to www.fernandesguitars.com, then to CUSTOMER SERVICE,TECHNICAL SUPPORT,MANUALS,and download the SUSTAINER FINE ADJUSTEMENTS, yo will get a back close up of the circuit.
Bye!