I found an extension called AiffWriter that does the trick. There were several builds of the extension I downloaded, but only one worked on my system (there was an older one from 1997 and a newer one from last June).
You select AiffWriter from the sound managers output area and it will write audio to a file. Not pretty but it works
If anyone wants the extension do a search for it or message me and I can email it over, only afew K.