I want to use the secondary audio source, but the external audio input at line-in jack is not audible. Why not?
This audio input is sent back to the Onsight Expert over the Subject Audio stream. The first area to check on the Onsight Device is the Configuration > Audio > Source menu option. Make sure that you select the ‘External Audio Input’ option. At the Onsight Expert check the Volume panel in the Call Window while in a call and verify that the Subject audio stream in not muted. If you still experience a problem, it could be that the input signal is simply too low. It requires a line level of approximately 1Vrms.