Umberto, the trick doesn't work, I often get "no audio" again as soon as I load the flight (and no other sources are present in the GSX Audio menu) and I need to restart Coautl. Am I the only one?
You're not the only one... I have GSX using the speakers in my monitor (via HDMI), and I'm frequently met with "no audio", despite sound working in a previous sim session.
Restart couatl, and I'm back to HDMI monitor speakers.
What's weird is, I've used GSX for P3D for years with this setup... Has only started happening with GSX Pro with MSFS