Please follow these steps to setup DigiLink Nano on an Apple Macintosh computer.
First, connect DigiLink Nano to a USB port on your computer with the supplied USB cable. Then open System Settings and double click on the Sound icon.
Click on the Output tab and check that there is a device called USB audio CODEC. Make sure it is not selected as the default device.
Do the same on the Input tab.
To change output level and input sensitivity, open the application Audio MIDI Setup. Select the device USB audio CODEC 1 with 2 outs to set output level. It is recommended to set these levels to 1.0 and then adjust your radio's input sensitivity to a suitable level to get a clean transmission signal. If your radio does not have the possibility to adjust input sensitivity or if you cannot find a setting that leads to a clean signal, change the output level here and/or your digital mode application.
Select the device USB audio CODEC 2 with 1 ins to change the input level. It is recommended to set this level to about 0.3 and then adjust your radio's audio output to have a clean input signal (refer to the documentation of your digital mode application for the required level). If your radio does not have the possibility to adjust its output or if you cannot find a setting that leads to a clean signal, change the input sensitivity accordingly.
You are now done with the macOS setup and can start to use DigiLink Nano in your digital mode applications.