If nothing was unclear or difficult, say so. Skip questions about steps you did not experience; use not applicable where appropriate.

Where was audio difficult to follow?
Which part of the session was affected?
What alternative would help?

Author notes / illustrative keys where applicable:
1. Use this answer to locate the part of the experience that needs explanation. The example issue to investigate is: audience questions cannot be heard at the back.
2. The affected session segment helps separate audibility problems from an entire event rating. Check the room, format and moment described before changing arrangements; reported difficulty does not establish a technical equipment diagnosis.
3. Turn the requested improvement into a testable next step. One illustrative action is: use a microphone for audience contributions.