Firstly you'd need an old version to be able to do this - it really wouldn't be easy to do this with the present release because it doesn't support the old scripting language. Secondly, you might, if you search diligently, find some information about this in the old Syntrillium archives, which you will find here. There are some proprietary scripts around as well, but they have similar limitations in terms of which version of Audition they will run on, and they will also cost you money. Back in the dark ages I got paid to convert some of these to run on more recent versions, but only on the condition that I didn't reveal what was in them, so I'm afraid I can't tell you.
What I can tell you though, is that the whole subliminal recordings thing is a con. You could get more of a buzz out of the Brainwave Synchroniser...
Thanks for that - it is obvious that I nedd a copy of Cool Edit Pro.
I have downloaded a trial copy of Adobe Audition CC - but think that the CEP software is better suited to me so, can you advise me which version to look for? I have seen various references to .v. 2.1 for this purpos- but would appreciate your advice.