DirectOut MADI.MONI Firmware ReadMe, 2016-03-18 Version 1.3 - Calibration for coaxial I/O added: connect a loop from BNC Output to BNC input. Press and hold VOL/CH and MENU buttons for 5 seconds until "C1" is displayed. During the calibration process "C2" and "C3" will be displayed. When the calibration is done the device returns to normal operation mode. Version 1.2 initial release DirectOut GmbH, 2016