I would like to switch from XLR to RCA and vice versa without the need of pulling the unused cable out of the amp.

This setup essentially functions as a source selector. For detailed instructions on wiring an RCA connector to the UcD module, please refer to our application note "Dealing with Legacy Pin 1 Problems".

To implement the setup, install a DPDT switch to connect the hot and cold inputs of the UcD module to either pins 2 and 3 of the XLR connector or the signal and shell contacts of the RCA connector. Note that pin 1 of the XLR connector remains hardwired to the chassis and is not switched. Similarly, the RCA shell contact remains hardwired to the chassis.

When the DPDT switch is set to RCA, the cold input of the UcD module is grounded via the RCA connector. For further details, refer to the schematic in the "Dealing with Legacy Pin 1 Problems" application note.