When there's no sound
If something goes wrong during the event, start here. Narrow down the cause in this order: sound → subtitles and translation → display → OBS.
Sound flows mixer → audio interface → laptop → EventCAT. Find out how far it gets, and you'll narrow down the cause.
① The audio interface LED doesn't respond
The mixer output isn't reaching the audio interface. Check that the XLR is firmly plugged into input 1 → ask the sound engineer to confirm the mixer output channel is active → swap in another XLR cable to rule out a faulty one.
② The LED responds, but the laptop gets no sound
The laptop doesn't recognize the audio interface as an input. Go to Sound settings → check that the input device is the audio interface → check the input level meter → plug the USB into another port or replace the cable.
③ The laptop gets sound, but EventCAT doesn't pick it up
Check that EventCAT's input device is set to the audio interface → refresh the browser → click the lock icon in the address bar and make sure mic permission is Allow → confirm sound is detected on a mic test site.
Tip If none of this works, close the browser tab completely and open it again.