No Audio setting in "Remote Device Setttings" section

Hi GL.inet KVM team,

I can’t get remote audio on my local computer and it has no audio option in the section of “Remote Desk Setting”. Below is the screen shot is the remote computer screen show on my local computer and the KVM has been upgraded to the latest version(1.4.2 release 1). I have tried to reboot the KVM but it is still no audio output.

Audio is not supported in Direct mode, please change to WebRTC mode.

Thanks. I get audio signal after change to WebRTC mode.