The socket marked Trigger provides a 12V DC switched output voltage for remote power-on of units with this facility (such as the Pro-Ject Amp Box SE or Pro-Ject Amp Box SE Mono), which corresponds to the position (on/off) of the power switch (A) on the front panel.
Pressing the Input Select buttons A and B selects the inputs 1 - 4 in turns. The selected input will be shown in the display. The optional input expander Pro-Ject Switch Box provides three more inputs. For further details please see the user guide of the Pro-Ject Switch Box.
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