This recording had two audio sources: a clip-on wireless mic and a standalone Zoom H2 recorder using its built-in microphones. As was too often the case in this venue, there was a lot of interference on the wireless mic. After synchronizing I opted to go solely with the Zoom recording. It got started late, so there is the somewhat weird transition at about 30 seconds from one mic to the other.
The Zoom recording sounds pretty distant but it's intelligible. It also did a pretty good job of picking up the audience discussion. The Levelator did its thing to balance the levels.
1. It's always good to have a backup recording.
2. Build a Faraday cage around the room to kill electrical interference?
3. Well, more practically, use a clip-on mic into a portable audio recorder that the presenter can stick into his/her pocket. We will illustrate this technique in future recordings.
4. Or, have the wireless receiver really close the presenter and record into a portable recorder like the Zoom instead of directly into the camera.