407 single channel, 130 twin channel
Hmmmm .... The 407 RFM states that with FADEC software 5.356 installed, "the engine uses a digital electronic control system based on two electronic governors called a primary channel and reversionary governor. The primary channel is a full-authority digital electronic control (FADEC) that controls, monitors and limits engine power while maintaining rotor speed. The reversionary governor can automatically take control of the engine in the event of a primary channel failure."
It is my understanding (possibly incorrect) that 5.356 software is installed on more recently produced aircraft.