Easily increase system inputs and outputs.The EXi8/Exo8 are input/output expanders for the MTX/MRX Series. EXi8 converts the analog mic/line signal to digital and transmits to the MTX via Yamaha's proprietry YDIF connection. The preamps for EXi8 can be remotely controlled from an MTX/MRX Editor. EXo8 also connects to the system via YDIF and features 8ch of DA converters that convert the digital output to high quality analog signal.