Is there a line-out socket in the Uher 4200 Report IC? Might this be the six pin DIN socket on the right-hand side?
The line-in, Line-out connection is made using the Radio/Phono Socket. The six pin socket, marked with a ▲ is where you connect the external power supply and battery charger, it is also used for external control devices (foot switch, ect.).
Clearfield KY USA