I am not sure if you are using the IXEG or some other aircraft??
Here is the LIGHT TEST button, if you activate it, no sound is played:
Here is the Firewarning test switch, if you toggle it to the right, the warning lights illuminate and the bell sounds:
Here is the EFIS CONTROL PANEL with the VOR/ADF pushbutton, if you enable it, you can see RMI indications on the EHSI map: