During Google Summer of Code 2009 project I worked on implementing repository plugins that would allow users to record audio files directly into Moodle. Initially, the plan was to provide a single recording only, but things went a bit further, and I also implemented a collection management feature.
Both plugins have integrated help pages for all their features, but additional help (mostly for developers) is in the Record audio repository plugin wiki page. Some discutions focused on audio and/or video recording in Moodle are in the Record audio repository plugin (was Wanted: New feature ideas for GSOC projects) and GSOC: Record Audio/Video directly into resources/activities forums. The later is more general, not only about the repository plugin. Last, but not least, there also a place for feature requests and bug reports in the MDL-18341 ticket.
The plugins are not included in the Moodle releases (not even the 2.0 dev daily build). In order to test them, you'll need to use a 2.0 dev daily build.
The Riffly plugin allows audio-only or audio-video recording inside the Moodle repositories. The flv files are stored on riffly.com servers and, optionally, they can be downloaded into Moodle (to go under Moodle File API control). Recorded files and the recording flash object is available in all places where the repository is used to select files.
After you download a Moodle 2.0 dev build, you'll have to download the plugin manually from CVS and copy the entire riffly folder inside the repository folder of your Moodle instalation. Then go to the Plugins/Repositories entry of the Administration menu, enable the plugin and make it visible. When you're done, you'll have the option to create riffly site-wide, course-wide or per-user collections. For each collection, you can choose what type of content it accepts: audio, audio-video or none of them (to get a locked collection).
The Nanogong plugin allows audio-only recording inside the Moodle repositories. The wav files are stored into Moodle using the File API. The sound files can be recorded using the ImaACPCM or Speex codecs. As for the riffly plugin, recorded files and the recording applet are available in all places where the repository is used to select files.
After you download a Moodle 2.0 dev build, you'll have to download the plugin manually from CVS and copy the entire nanogong folder inside the repository folder of your Moodle instalation. Then go to the Plugins/Repositories entry of the Administration menu, enable the plugin and make it visible. When you're done, you can select the codec used and the quality of the sound for the site-wide recording instance. This instance will be shared by all users of your site (because it only handles recording, and File API handles the rest).
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