C-90 means is a USA Custom Shop model
F=Floyd Bridge- featuring the Graphtech Floyd LB63
P=Peizo - featuring the Graphtech acoustiphonic preamp
13= built in 13 pin interface
USB = our patented, built-in iGuitar.USB interface.
FSUS = built-in Fernandes Sustainer system
The picture shows our normal knob and switches for piezo and 13pin plus additional controls for the Fernandes Sustainer. The other picture shows the wiring and added electronics for the Fernandes Sustainer. Its hard to believe we fit it all in there!
