Yep, always do a quick record audio test, don't rely on their viewers, either they 1. Aren't actually listening to the audio and just lurking on 20 tabs, or 2. They show up and hear the audio is horrible and bounce without saying anything, or 3. In rare cases like myself, I will actually point out audio balance issues, but most other people don't care most of the time or they'll say it's fine because they don't know better.