Comment There's really no need to overcomplicate things (Score 1) 126
When I've felt the need to provide audio recordings of my lectures, I simply record them with a pocket voice recorder that records directly to mp3 and mounts as a usb drive. My recorder is a Sony, but there are many on the market that are as good or better. From there it's easy to post them on Blackboard, Moodle, WebCT, or whatever courseware the teachers are using. When we do video, that's generally more of a production involving IT people and a different hosting server, but for audio a very simple approach seems to be the best.