thanks a lot for your reply. The radio is connected to the NoMachine server through a built-in sound card used to source the audio to be processed in DSP and to sink the audio to transmitted. I can’t hear the radio through the server locally and physically. I don’t know how to pass the audio from the built-in card in the radio to the sound card of the server.
Moreover I have also a server made with raspberry Rpi4 that is working thanks to PulseAudio and Pavucontrol and a script to redirect the audio to a dummy , but here the problem is that the streaming is not reliable. Some times it works some other not.