If your institution has enabled audio capture, it'll show up in the results report. Similar to camera monitoring, audio capture records small audio fragments during the activity.
For this to happen, the student needs to grant microphone permissions to the browser while they're doing the activity.
Audio capture activates when the microphone detects noise above a certain threshold. At that point, an audio recording starts, lasting a maximum of 20 seconds, with an interval of up to 30 seconds between recordings.
SMOWL captures the audio, but it doesn't validate it.
Review of Audio Incidents
As with other monitoring tools, you'll find a visualization of the audio results and an incident report, which can be played in your browser.
The report will display any detected incidents. Incidents are defined as actions that prevent audio capture, such as:
Not granting microphone permissions.
Not having a microphone installed.
It's possible that if the user remained completely silent and no sufficiently loud sound occurred, there might be no audio recorded from the activity.