vCast Sender for Windows, change audio casting to the panel, I don't want the audio playing on the laptop speakers.

To change the audio playback while casting follow the information below. 

Once the PC is connected to the display using vCast, the audio output can be changed.

1. Go to the audio playback option by clicking on the speaker icon in the lower right hand corner. 

2. Change the playback device to (Virtual Audio Cable) and the  audio should start playing on the display. 

The volume may show muted, this is normal.

to panel will turn-ON laptop speaker again.