I think what you want is available from the Options icon, Users tab, then edit a user, and at the bottom check the "On longin play sound" box. Do this for each user you want to monitor.
Thanks, but I was not thorough in my need: I need the sound to play when ANYONE is attempting to log-in. When someone, not an authorized user, is attempting to log-in, the "Viewer" icon illuminates, but I usually don't know the attempt was made till later when I look at the "Connection" in the "Status". I want to be notified by sound while the hacker is trying to log-in! The current "On login play sound" works only when an authorized user is logging in! I have no concerns with my authorized users, but I am wishing to keep an eye on the hackers.
Since the "Veiwer" icon illuminates, I know
Blue Iris "sees" the attempt, so I just want Blue Iris to also play a sound!