you can edit a recording by downloading the files and making the edits, then re-uploading the files, or placing the files back on the server (if licensed, with file system access).
this is not a straightforward process and there are some considerations:
are you hosted or licensed?
do you need the recording URL to remain the same?
is it worth the time? (it may take a few hours to accomplish in a satisfactory manner)
everything is either xml or flv. you find the offending audio, convert to mp3 for ease of editing, make your edits, re-convert to flv.
let us know what you'd like to do.
the download link looks like this:
where foo.zip is the name you'd like for your download package